Checkpoint Past Papers-1-254

Cambridge Lower Secondary Checkpoint
*4657240416*
SCIENCE 0893/01
Paper 1 October 2023
45 minutes
You must answer on the question paper.
No additional materials are needed.
INSTRUCTIONS
• Answer all questions.
• Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
• Write your name, centre number and candidate number in the boxes at the top of the page.
• Write your answer to each question in the space provided.
• Do not use an erasable pen or correction fluid.
• Do not write on any bar codes.
• You should show all your working in the booklet.
• You may use a calculator.
INFORMATION
• The total mark for this paper is 50.
• The number of marks for each question or part question is shown in brackets [ ].
This document has 20 pages. Any blank pages are indicated.
B23 10_0893_01/8RP
© UCLES 2023 [Turn over
2
1 The arrows show the pathway of water through the root.
water
enters B
the cell
soil particle
(a) Name the type of root cell labelled A.
[1]
(b) Suggest one way root cell A is adapted to its function.
Use the diagram to help you.
[1]
(c) Water is transported from the roots to the stem and the leaves through vessel B.
Name vessel B.
[1]
(d) Vessel B transports minerals to the leaves.
Name the mineral needed to make chlorophyll.
[1]
© UCLES 2023 0893/01/O/N/23

3
2 Safia has a solution of copper sulfate.
Describe how Safia makes large and dry copper sulfate crystals from this solution.
Use labelled diagrams to help you with your description.
[3]
© UCLES 2023 0893/01/O/N/23 [Turn over

4
3 Heat and temperature are different.
(a) Tick (✓) all the correct statements that describe heat.
a measure of how cold something is
a measure of how hot something is
a measure of the thermal energy of a substance
measured in MJ
transferred by conduction
[2]
(b) Measurements of temperature in °C can be positive, negative or zero.
Describe how the temperature measurements of water can be positive, negative or zero.
Use ideas about the three states of matter in your answer.
[2]
© UCLES 2023 0893/01/O/N/23

5
4 This question is about the carbon cycle and climate change.
(a) Complete the carbon cycle diagram.
Choose words from the list.
combustion decomposition feeding
photosynthesis respiration
sunlight
carbon dioxide in
the atmosphere
..........................................................
.......................................................... ..........................................................
fossil
.......................................................... fuel
power
station
..........................................................
dead plants
and animals
fossil fuels NOT TO SCALE
[3]
(b) Describe what happens during decomposition.
[1]
(c) The main cause of climate change is burning fossil fuels.
Describe one effect of climate change.
[1]

6
5 Mia and Aiko are discussing ideas about fetal development and the health of the mother.
A scientific study has shown that the mass

of an unborn baby will be less if the mother
has an unhealthy diet.
So, I think the mother should be careful

what she eats.
Mia
My mother says she ate what she
wanted and I was born healthy.
So, I don’t think it matters what

the mother eats.
Aiko
(a) Who has made a more informed decision?
Tick (✓) one box.
Mia Aiko
Explain your answer.
[1]
(b) The diet of the mother is one factor that affects fetal development.
Write down one other factor that affects fetal development.
[1]
© UCLES 2023 0893/01/O/N/23

7
6 Many scientists believe that a large asteroid collided with the Earth over 65 million years ago.
(a) Two effects of this collision were the formation of a crater and climate change.
Write down one other possible effect of this collision.
[1]
(b) Carlos models an asteroid colliding with the Earth.
He drops a steel ball into a box containing sand.
steel ball
sand
crater
before after
(i) Describe what the steel ball and the sand represent in his model.
steel ball
sand
[2]
(ii) Suggest two ways Carlos increases the width and depth of the crater.
2
[2]

8
7 Waveforms show how sound waves interact.
Look at the different waveforms.
A B
C D
(a) Waveform B is the result of the interaction between two waveforms.
Which word describes this interaction?
[1]
(b) Look at this diagram showing two waveforms.
Which waveform A, B, C or D is the result of the interaction between these two waveforms?
[1]
(c) Look at this diagram showing two waveforms.
Which waveform A, B, C or D is the result of the interaction between these two waveforms?
[1]
© UCLES 2023 0893/01/O/N/23

9
8 (a) Chen investigates the inheritance of sex in humans.
Chen:
• uses green balls to represent gametes with X chromosomes
• uses yellow balls to represent gametes with Y chromosomes
• puts 25 green balls and 25 yellow balls into bag A
• puts 50 green balls into bag B
• takes one ball out of each bag and records the colours
• returns the balls to their bags.
Explain why bag A represents male gametes.
[1]
(b) Chen takes balls out of the bags five more times.
(i) Look at the table of his results.
The table is not complete.
Complete the table to identify if the two balls (gametes) chosen represent a male or a
female offspring.
colour of ball from colour of ball from male or female

bag A bag B offspring
1 green green
2 yellow green
3 green green
4 yellow green
5 green green
6 green green
[1]
(ii) The chance of a male and a female producing a male offspring is 50%.
Chen’s results do not show a value of 50%.
Suggest why.
[1]

10
9 Sodium is in Group 1 of the Periodic Table.
Sodium reacts with chlorine to form an ionic compound.
This ionic compound contains sodium ions, Na+, and chloride ions, Cl –.
Why is a sodium ion positively charged?
Circle the correct answer.
a sodium atom gains a proton
a sodium atom loses a proton
a sodium atom gains an electron
a sodium atom loses an electron
[1]
© UCLES 2023 0893/01/O/N/23

11
10 The albatross is a sea bird with very long wings.
(a) The albatross may have long wings due to the process of natural selection.
Tick (✓) all the boxes that show correct statements about natural selection and the
albatross.
The albatross with longer wings pass on their genes to their offspring.
There is no variation in the length of albatross wings.
The albatross do not compete for food.
The length of the wings decreased over many generations.
The albatross with longer wings are more likely to survive.
[2]

12
(b) A scientist counts the number of albatross that nest on an island every year.
Look at the results.
2000
1800
1600
1400
number of
albatross
1200
1000
800
600
1980 1990 2000 2010 2020
year
Complete these sentences.
Between the years 1980 and 2020, the number of albatross .
One reason for this could be .
If the trend in the graph continues, the albatross species could become
.
[3]
© UCLES 2023 0893/01/O/N/23

13
11 Rajiv investigates the reaction of zinc, Zn, and dilute sulfuric acid, H2SO4.
Hydrogen, H2, and zinc sulfate, ZnSO4, are made in the reaction.
(a) Write the symbol equation for this reaction.
+ +
................................. ................................. ................................. .................................
[2]
(b) Rajiv:
• puts 25 cm3 of dilute sulfuric acid into a flask

• adds 0.50 g (an excess) of zinc powder to the sulfuric acid
• assembles the equipment shown in the diagram
20 40 60 80 100 cm3
gas syringe
flask
25 cm3 of dilute sulfuric acid
0.50 g (an excess) of zinc powder
• measures the total volume of hydrogen collected in the gas syringe every 10 seconds.

14
(i) Look at the graph showing his results.

80
60
total volume
of hydrogen
collected 40
in cm3
20
0
0 10 20 30 40 50 60 70 80
time in s
Rajiv repeats the experiment using the same quantities of zinc powder and dilute sulfuric
acid.
He uses acid at a higher temperature.
He does not change any other conditions.
Sketch a line on the graph to show the results of this experiment.
Label the line H.
[2]
(ii) Rajiv repeats the experiment a second time using the same quantities of zinc and dilute
sulfuric acid.
He uses a lump of zinc instead of zinc powder.
He does not change any other conditions.
The rate of the reaction decreases.
Explain why.
Use ideas about the particle model.
[2]
© UCLES 2023 0893/01/O/N/23

15
12 Blessy investigates floating and sinking.
She puts a whole lemon in a beaker of water.
lemon
water
The whole lemon floats.
Water has a density of 997 kg / m3.
Whole lemon has a density of 984 kg / m3.
Look at the table showing the density of different parts of a lemon.
density
part of lemon
in kg / m3
peel 956
segment 998
seed 925
(a) Predict which parts of the lemon float when in water.
[1]

16
(b) Blessy wants to find out if the different parts of a lemon will float or sink in salt solution.
She predicts that as the concentration of salt solution increases eventually all three parts of
the lemon will float.
Write a plan for her investigation.
[2]
© UCLES 2023 0893/01/O/N/23

17
13 Elements and compounds either have a giant structure or a simple structure.
The table shows information about five substances.
Complete the table to identify if the structure of each substance is giant or simple.
does it conduct structure

substance melting point boiling point
electricity (giant or simple)
J low low no
K high high yes
L low low no
M high high no
N high high no
[2]

18
14 Ahmed describes an electrical circuit.
My circuit is a complete series circuit with:

• one battery of cells
• two lamps
• one open switch
• one variable resistor
• one meter to measure the current in the whole circuit
• one meter to measure the voltage across the variable resistor.
Draw his circuit using conventional symbols.
The battery of cells has been drawn for you.
[4]
© UCLES 2023 0893/01/O/N/23

19
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Cambridge Assessment International Education is part of Cambridge Assessment. Cambridge Assessment is the brand name of the University of Cambridge
Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge.

© UCLES 2023
The Periodic Table of Elements
Group
1 2 3 4 5 6 7 8
1 2
H He
hydrogen helium
Key 1 4
3 4 atomic number 5 6 7 8 9 10
Li Be atomic symbol B C N O F Ne
lithium beryllium name boron carbon nitrogen oxygen fluorine neon
7 9 relative atomic mass 11 12 14 16 19 20
11 12 13 14 15 16 17 18
Na Mg Al Si P S Cl Ar
sodium magnesium aluminium silicon phosphorus sulfur chlorine argon
23 24 27 28 31 32 35.5 40
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
potassium calcium scandium titanium vanadium chromium manganese iron cobalt nickel copper zinc gallium germanium arsenic selenium bromine krypton
39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
20
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
rubidium strontium yttrium zirconium niobium molybdenum technetium ruthenium rhodium palladium silver cadmium indium tin antimony tellurium iodine xenon
0893/01/O/N/23
85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131
55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
lanthanoids
Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
caesium barium hafnium tantalum tungsten rhenium osmium iridium platinum gold mercury thallium lead bismuth polonium astatine radon
133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – –
87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
actinoids
Fr Ra Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
francium radium rutherfordium dubnium seaborgium bohrium hassium meitnerium darmstadtium roentgenium copernicium nihonium flerovium moscovium livermorium tennessine oganesson
– – – – – – – – – – – – – – – – –
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
lanthanoids La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
lanthanum cerium praseodymium neodymium promethium samarium europium gadolinium terbium dysprosium holmium erbium thulium ytterbium lutetium
139 140 141 144 – 150 152 157 159 163 165 167 169 173 175
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
actinoids Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
actinium thorium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium fermium mendelevium nobelium lawrencium
– 232 231 238 – – – – – – – – – – –

SCIENCE 0893/02
45 minutes
INSTRUCTIONS
INFORMATION
This document has 16 pages.
IB23 10_0893_02/9RP
2
1 The diagram shows the position of some organs in the human body.
A
D
B
C
(a) Circle the letter of the organ that is part of the human excretory (renal) system.
A B C D [1]
(b) Complete these sentences about the human excretory (renal) system.
The function of the human excretory (renal) system is to the
blood to remove urea.
The urea is then excreted in a liquid called .

[2]
(c) Organs are made of cells.
Cells contain chromosomes.
Name the chemical from which chromosomes are made.
[1]
© UCLES 2023 0893/02/O/N/23

3
2 Look at the elements in Group 1 from the Periodic Table.
The elements are in the same order as the Periodic Table.
element
lithium
sodium
potassium
rubidium
caesium
francium
(a) Describe how the melting points of the Group 1 elements change down the group.
[1]
(b) Name the most reactive element in Group 1.
[1]
(c) An element in Group 1 reacts with dilute hydrochloric acid.
Circle the gas made in this reaction.
carbon dioxide
chlorine
hydrogen
oxygen
[1]

4
3 Mike holds a metal cup containing water.
hand A
metal cup
containing water
hand B
(a) The water in the metal cup is at a higher temperature than both of his hands.
Describe what happens to the thermal energy in the water.
[1]
(b) Mike pours the water out of the metal cup.
He adds ice and water to the metal cup.
Describe what Mike feels with hand B compared to hand A.
[1]
4 The atoms in a molecule of water are joined together by covalent bonds.
(a) What is a covalent bond?
[2]
(b) The formula for a molecule of ethane is C2H6.
How many atoms are bonded together in one molecule of ethane?
[1]
© UCLES 2023 0893/02/O/N/23

5
5 Priya compares different sound waveforms.
All the waveforms are drawn to the same scale.
A B
C D
(a) Which two waveforms have the lowest amplitude?
and [1]
(b) Which two waveforms have the lowest frequency?
and [1]
(c) Which two waveforms have the highest pitch?
and [1]
(d) Draw a waveform on the grid with a greater loudness than waveform E.
E
[1]

6
6 Look at the food web for a habitat.
lion
jackal
wild cat
rabbit
owl
small
rodents
green plant
NOT TO SCALE
(a) A disease decreases the number of small rodents in the habitat.
The number of owls decreases but the number of wild cats stays the same.
Complete the sentences to explain why.
The number of owls decreases because
The number of wild cats stays the same because
.
[2]
(b) Explain why green plants need the Sun to survive.
[3]
© UCLES 2023 0893/02/O/N/23

7
7 An object has volume, mass and density.
The object has a volume of 28 cm3.
The mass of the object is 222 g.
Calculate the density of the object.
g / cm3 [2]
8 The diagram shows part of the Periodic Table.
1 2
H He
3 4 5 6 7 8 9 10
Li Be B C N O F Ne
11 12 13 14 15 16 17 18
19 20
K Ca
(a) Which element in the table has the lowest number of protons in its atom?
[1]
(b) Identify two elements from the table that are in the same period as the element Mg.
and [1]
(c) Name one element from the table that has the same chemical properties as the element Ar.
[1]

8
9 Mia is learning about tectonic plates.
She knows that:
• diverging tectonic plates move away from each other
• converging tectonic plates move towards each other.
(a) Label the diagram.
diverging plates convection currents converging plates
crust mantle
........................................... ........................................... ...........................................

........................................... ........................................... ...........................................
...........................................
...........................................
...........................................
...........................................
[2]
© UCLES 2023 0893/02/O/N/23

9
(b) Mia joins a map of South America to Africa.
Africa
South
America
Explain why the appearance of the continental coasts is evidence for tectonic plates.
[2]
(c) Write down one other piece of evidence for tectonic plates.
[1]

10
10 Oliver connects a resistor in an electrical circuit.
He measures the current as he increases the voltage across the resistor.
Oliver draws a graph.
current in A
0
0 1 2 3 4 5
voltage in V
(a) Current is measured in A (amps) and voltage is measured in V (volts).
Write down the unit of resistance.
[1]
(b) Calculate the resistance of the resistor.
Include the equation used to calculate resistance in your answer.
resistance = [2]
© UCLES 2023 0893/02/O/N/23

11
11 Scientists believe that the Moon was formed after a collision between the Earth and another
small planet.
This is called the collision theory for the formation of the Moon.
debris
Earth
small planet
The debris from the collision collected to form the Moon.
(a) Chen collects information about the elements found on the Earth and on the Moon.
percentage of element found on the

element
Earth Moon
oxygen 45.3 44.7
silicon 22.0 22.5
magnesium 2.6 2.3
iron 6.0 8.3
calcium 3.6 3.1
(i) Most of the information supports the collision theory.
Explain how most of this information supports the collision theory.
[1]
(ii) There is a comparison of one element that does not support the collision theory.
Write down the name of this element.
[1]
(b) Suggest two other pieces of evidence Chen collects to support the collision theory.
[2]

12
12 Theories about the structure of the atom have developed over time.
Look at the models of an atom of nitrogen.
model A in 1904 model B in 1914
– electron
–
– – – nucleus
–
+ –
– – –
– –
– –
(a) Describe one similarity between model A and model B.
[1]
(b) Describe one difference between model A and model B.
[1]
(c) Model B is still used today.
Suggest one strength and one limitation of using model B.
strength
limitation
[2]
© UCLES 2023 0893/02/O/N/23

13
13 Yuri investigates convection.
He adds a drop of red ink to the cold water as shown in the diagram.
red ink
cold water
very
hot
water
(a) Complete the sentence to suggest a testable hypothesis for this investigation.
I predict that the red ink will move
because .
[1]
(b) Complete the table about safety risks and the control of risks in this investigation.
safety risk control of risk
very hot water may burn skin ………………………….………….
………………………….………….
red ink may irritate skin ………………………….………….
………………………….………….
………………………….…………. use plastic beaker instead of glass beaker
………………………….………….
[3]

14
14 Lily investigates variation in tomatoes.
Lily:
• measures the mass of different tomatoes to the nearest whole gram

• classifies the tomatoes into different groups based on their masses.
Lily writes about her results.
There were 3 tomatoes with a mass more than 105 g.

There were 2 tomatoes with a mass between 76 g and 80 g.
(a) (i) Complete the table of results by writing the:
• unit for the mass range

• number of tomatoes in each mass range.
mass range number of tomatoes

in …………………. in mass range
76 – 80
………………….
81 – 85
………………….
86 – 90
………………….
91 – 95
………………….
96 – 100
………………….
101 – 105
………………….
more than 105
………………….
[2]
© UCLES 2023 0893/02/O/N/23

15
(ii) What is the best way to present the data in the table?
[1]
(b) Gardeners add nitrates to the soil to help tomato plants grow.
The nitrates are used by the plants to make a substance needed for growth.
Name this type of substance.
[1]

© UCLES 2023
Group
1 2 3 4 5 6 7 8
1 2
H He
hydrogen helium
Key 1 4
11 12 13 14 15 16 17 18
23 24 27 28 31 32 35.5 40
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
16
0893/02/O/N/23
85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131
55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
lanthanoids
133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – –
87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
actinoids
– – – – – – – – – – – – – – – – –
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
139 140 141 144 – 150 152 157 159 163 165 167 169 173 175
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
– 232 231 238 – – – – – – – – – – –

SCIENCE 0893/01
Paper 1 April 2023
45 minutes
INSTRUCTIONS
INFORMATION
IB23 05_0893_01/6RP
2
1 This question is about the human excretory (renal) system.
(a) Complete these sentences about the structure and function of the excretory (renal) system.
The excretory (renal) system filters blood.
Blood enters the where it is filtered, and urine is formed.
This urine passes along a tube called the towards the bladder.
The urine is stored in the bladder.
Urine is released from the body through a different tube called the .
[3]
(b) The table shows the percentage concentration of four substances in blood plasma and in urine.
percentage concentration of substance

substance
in blood plasma in urine
ammonia 0.00 0.05
protein 9.00 0.00
salt 0.60 0.90
urea 0.03 2.00
Which substance has the greatest increase in the urine compared to blood plasma?
Choose from the list.
ammonia protein salt urea
[1]
© UCLES 2023 0893/01/A/M/23

3
2 Aiko calculates the density of some objects.
(a) A block of iron has a mass of 19.68 g.
The volume of the block is 2.50 cm3.
(i) Write down the equation Aiko uses to calculate density.
density = [1]
(ii) Calculate the density of Aiko's block of iron.
density = g / cm3 [1]
(b) Aiko calculates the density of four objects.
Look at her results.
density
object
in g / cm3
A 2.7
B 8.4
C 0.002
D 13.6
Which object is a gas?
A B C D
[1]
© UCLES 2023 0893/01/A/M/23 [Turn over

4
3 Look at the diagram of a vacuum flask.
Gabriella puts a hot liquid into the vacuum flask.
The flask keeps the hot liquid warm.
lid
stopper
hot liquid
plastic case
vacuum (no particles)
shiny silver surfaces
(a) Which material is most suitable to make the stopper?
copper gold iron plastic
[1]
(b) (i) Suggest how the shiny silver surfaces help to keep the liquid warm.
[1]
(ii) The vacuum does not contain any particles.
Explain why the vacuum reduces the transfer of thermal energy.
[2]
© UCLES 2023 0893/01/A/M/23

5
(c) Gabriella removes the lid and the stopper from the vacuum flask.
Some of the hot liquid evaporates.
What happens to the temperature of the liquid that remains in the vacuum flask?
Explain why.
Use ideas about particles.
[3]

6
4 The Earth's crust is made of a number of large pieces.
(a) What is the name given to these pieces of the Earth’s crust?
earthquake inner core mantle tectonic plates
[1]
(b) Look at the map showing the positions of earthquakes around the world in 2021.
earthquake
Suggest how the position of earthquakes provides evidence for the large pieces of the crust.
[1]
© UCLES 2023 0893/01/A/M/23

7
(c) Look at the two maps showing the jigsaw appearance of the continental coasts.
equator equator
3000 million years ago today
(i) What is meant by the jigsaw appearance of the continental coasts?
[1]
(ii) The continents have moved since 3000 million years ago.
Explain how the continents move.
[2]

8
5 The diagram shows a model of a hydrogen molecule.
= electron
H H
(a) Name the type of bonding in a hydrogen molecule.
Explain how you can tell from the diagram.
[2]
(b) Look at the diagrams showing a chlorine atom and a chloride ion.
Cl Cl
chlorine atom, Cl chloride ion, Cl –
Describe how a chloride ion is made from a chlorine atom.
[1]
(c) Sodium chloride, NaCl, is made up of sodium ions, Na+, and chloride ions, Cl −.
Explain how the ions in sodium chloride are held together.
[1]
© UCLES 2023 0893/01/A/M/23

9
6 This is a question about photosynthesis and plant minerals.
(a) Look at the diagrams of different plant cells.
contains green pigment
A onion epidermal cells B palisade cells
contains green pigment
C cells found in xylem D guard cells
root hair
E epidermal cell in the root
Which two diagrams show plant cells that photosynthesise?
Choose from A, B, C, D and E.
and [2]

10
(b) Carlos investigates the effect of magnesium on plant growth.
Carlos makes a hypothesis about the effect of magnesium on plant growth.
He uses the equipment in the diagram.
seedling
air tube cotton wool
lid
beaker
solution
containing
minerals
In his first experiment Carlos:
• fills a beaker with a solution containing all the minerals needed for healthy growth
• assembles the equipment and seedling as shown in the diagram
• records the appearance of the seedling after four weeks.
Carlos repeats the experiment.
In his second experiment, he uses a solution that contains all the minerals needed for healthy
growth except magnesium.
(i) Carlos makes a hypothesis about the effect of magnesium on plant growth.
Suggest a suitable hypothesis.
[1]
© UCLES 2023 0893/01/A/M/23

11
(ii) In his first experiment, Carlos uses a solution with all the minerals needed for healthy
growth.
Explain why this is important.
[1]
(c) Carlos draws a diagram to show the appearance of the plant from the first experiment after
four weeks.
healthy green
leaves
seedling in first experiment

after four weeks
Carlos repeats his experiment again.
In his third experiment, he uses a solution that contains all the minerals needed for healthy
growth except nitrates.
Predict the appearance of the seedling left in the solution without nitrates after four weeks.
Give a reason for your answer.
[2]
(d) Which substance is made inside chloroplasts?
[1]

12
7 Ahmed hears two sounds, A and B.
Look at the waveforms for these two sounds.
waveform A waveform B
0 2 4 6 8 time in
seconds
Give one similarity and one difference between waveform A and waveform B.
similarity
difference
[2]
© UCLES 2023 0893/01/A/M/23

13
8 When asteroids collide with the Earth, they make craters.
Chen uses a model to investigate the effect of asteroid collisions with the Earth.
In his investigation Chen:
• drops a rock into a container of soil
• measures the size of the hole in the soil made by the rock.
(a) Complete the sentences about Chen’s model.
In the model the rock represents .
In the model the soil represents .
In the model the hole represents .

[2]
(b) Write down one strength and one limitation of his model of asteroid collisions with the Earth.
strength
limitation
[2]

14
9 Myxomatosis is a disease that kills rabbits.
(a) Describe the effect of myxomatosis on the size of a rabbit population.
[1]
(b) Foxes hunt rabbits for food.
The graph shows the population of foxes and the population of rabbits.
population
time
Tick (✓) the box that shows the population of rabbits.
line A line B
Give two reasons for your answer.
[2]
© UCLES 2023 0893/01/A/M/23

15
10 Blessy makes some magnesium sulfate.
She adds an excess of magnesium to some dilute sulfuric acid until the reaction stops.
Unreacted magnesium is left at the bottom of the solution.
magnesium sulfate solution
unreacted magnesium
(a) Describe how Blessy separates the magnesium sulfate solution from the unreacted magnesium.
[1]
(b) Blessy wants to make solid magnesium sulfate from the magnesium sulfate solution.
Describe how she makes solid magnesium sulfate.
[1]
(c) Blessy now wants to make zinc chloride.
Write down the name of the metal and acid she uses to make zinc chloride.
metal
acid
[1]

16
11 The circuit diagram shows the circuit Priya makes using switches and identical lamps.
J M
K S
(a) Priya connects a meter to measure the current at position M in the circuit.
Draw the correct symbol for the meter she uses to measure the current.
[1]
(b) Priya opens and closes different switches.
Complete the table by writing if the:
• switches are open or closed
• lamps are on or off.
switch R switch S switch T lamp J lamp K lamp L
closed open open off

........................ ........................
open closed closed off

........................ ........................
on off on
........................ ........................ ........................
[3]
(c) Describe how Priya connects a voltmeter to measure the voltage across lamp J.
[1]
© UCLES 2023 0893/01/A/M/23

17
12 Pierre investigates the reaction between calcium carbonate and dilute hydrochloric acid.
The reaction gives off carbon dioxide gas.
Look at the equipment he uses.
glass wool plug
100 cm3 dilute hydrochloric acid

20 g calcium carbonate
102.34 g X
(a) Write down the name of equipment X.
[1]

18
(b) Pierre measures the loss in mass every minute for 4 minutes.
Here are his results.
At the start the loss in mass is 0.0 g

1.5 g is the loss in mass after 4 minutes
3 minutes = a loss in mass of 1.2 g
After 1 minute the loss in mass is 0.8 g
1.1 g = 2 minutes
Complete his results table.
............................................... loss in mass

in g
...............................................
............... ...............
............... ...............
............... ...............
............... ...............
............... ...............
[2]
© UCLES 2023 0893/01/A/M/23

19
BLANK PAGE

© UCLES 2023
Group
1 2 3 4 5 6 7 8
1 2
H He
hydrogen helium
Key 1 4
11 12 13 14 15 16 17 18
23 24 27 28 31 32 35.5 40
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
20
85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131
55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
0893/01/A/M/23
lanthanoids
133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – –
87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
actinoids
– – – – – – – – – – – – – – – – –
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
139 140 141 144 – 150 152 157 159 163 165 167 169 173 175
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
– 232 231 238 – – – – – – – – – – –

SCIENCE 0893/02
Paper 2 April 2023
45 minutes
INSTRUCTIONS
INFORMATION
IB23 05_0893_02/5RP
2
1 This question is about a small mammal called a shrew.
(a) Look at the picture of two shrews from the same species.
Each shrew has a different fur colour.
Fur colour is controlled by genes.
Write down the name of the chemical that makes up genes.
[1]
(b) Eagles feed on shrews.
Scientists sample the population of the shrews living on ground that is dark in colour.
The diagram shows the population of shrews over two years.
The population of shrews for year 3 is not shown.
An eagle feeds on the shrews during years 2 and 3.
eagle
ground that is dark in colour
year 1 year 2 year 3 time
© UCLES 2023 0893/02/A/M/23

3
(i) The total population size of the shrews is the same during all three years.
Predict the numbers of white shrews and grey shrews in year 3.
Write your prediction in the table.
fur colour number in population in year 3
…………………………
…………………………
[1]
(ii) Describe how natural selection explains the changes in the numbers of white and grey
shrews.
[3]
(iii) The scientists had to trap and release the shrews to get their results.
Write down two safety precautions the scientists took when trapping and releasing the
shrews.
2
[2]

4
2 Look at the diagram showing part of the Periodic Table.
H He
Li Be B C N O F Ne
K Ca transition elements
(a) The electronic structure of lithium is 2.1.
Write down the electronic structure of chlorine.
[1]
(b) Write down the symbol for the atom which has 12 protons in its nucleus.
[1]
(c) Neon is in Group 8 of the Periodic Table.
Neon is an unreactive gas at room temperature.
Argon is also in Group 8.
Suggest one property of argon.
[1]
© UCLES 2023 0893/02/A/M/23

5
3 Water moves through a plant.
(a) The table shows information about the pathway of water into and out of a plant.
Number 1 is the part where water enters the plant.
Number 5 is the part where water is lost from the plant.
Complete the table by writing the numbers 1, 2, 3, 4 and 5 to show the pathway of water into
and out of a plant.
One has been done for you.
part of plant order of pathway
leaf
5
leaf xylem
....................
root hair cell

....................
root xylem
....................
stem xylem
....................
[1]
(b) Plants lose water from the surface of their leaves.
Write down the name of this process.
[1]
(c) A desert plant grows well due to its very waxy leaves.
High carbon dioxide levels reduce wax production in these plants.
Cars produce carbon dioxide.
Suggest what happens to the population of these desert plants growing near a new road.
[1]

6
4 This question is about waveforms.
(a) Look at the diagram of the waveform of a sound.
Y
Z
time
W in seconds
Which letter shows the amplitude of the sound wave?
W X Y Z [1]
(b) The waveform for the sound shows several waves.
0 2 4 6 8 time
in seconds
How many complete waves are there in 8 seconds of the waveform?
number of waves [1]
© UCLES 2023 0893/02/A/M/23

7
(c) The diagrams show how sound A interacts with sound B to make sound C.
waveform of sound A
0 2 4 6 8 time
in seconds
+
waveform of sound B
0 2 4 6 8 time
in seconds
=
waveform of sound C
0 2 4 6 8 time
in seconds
Describe how the waveform of sound A and waveform of sound B interact at:
time = 1 second
time = 3 seconds
[2]

8
5 Look at the diagram of the carbon cycle.
sunlight carbon dioxide in

the atmosphere
combustion
process A
process B
decomposition
feeding
dead plants and animals
fossil fuels
(a) Write down the name of process A.
[1]
(b) Write down the name of process B.
[1]
(c) Write down one similarity between combustion and decomposition.
[1]
(d) Scientists believe that too much carbon dioxide in the atmosphere causes climate change.
Describe two possible effects of climate change.
[2]
© UCLES 2023 0893/02/A/M/23

9
6 Look at the data about some Group 1 elements.
melting point atomic radius

element
in °C in pm
lithium 181 145
sodium 98 180
potassium 64 220
rubidium 235
(a) Describe the trend in atomic radius as you go down Group 1.
[1]
(b) Predict the melting point of rubidium.
The melting point of rubidium is °C. [1]
(c) Sodium reacts with chlorine to make an ionic solid called sodium chloride.
Sodium chloride has a melting point of 808 °C.
Sodium chloride has a structure.
Name this type of structure.
[1]
7 Write down the names of these electrical symbols.
[2]

10
8 Here are some sentences about the collision theory for the formation of the Moon.
A The less dense rocks eventually merged together to form the Moon.
B This caused very high temperatures and the Earth’s outer layer melted.
C A collision occurred between the Earth and a small planet.
D The less dense rocks were ejected and cooled.
E The dense iron from the cores of both planets merged to create the Earth.
F The less dense rocks were captured by the Earth’s gravitational field.
(a) Put these sentences in the correct order to describe the collision theory.
Two have been done for you.
E F
[3]
(b) In 1969, astronauts went to the Moon and collected rock samples.
Describe how these Moon rock samples provide evidence to support the collision theory.
[1]
(c) Suggest why the density of the Earth is greater than the density of the Moon.
Use ideas from the collision theory in your answer.
[1]
© UCLES 2023 0893/02/A/M/23

11
9 Scientists estimate one million species of plants and animals are at risk of extinction.
(a) Which factors cause a species to become extinct?
Tick (✓) the two correct factors.
changes in seasons
changes to the environment over time
increased reproduction
new diseases
new food sources
[2]
(b) Explain what is meant by the statement:
‘An animal is at risk of extinction.’
Use ideas about death rate and reproduction rate.
[1]

12
10 Look at the list of metals in order of reactivity.
The most reactive metal is at the top.
calcium
magnesium
zinc
increasing reactivity
iron
copper
silver
A piece of copper is dipped into silver nitrate solution.
Silver is made.
A blue solution of copper nitrate is also made.
(a) What is the name of this type of reaction?
crystallisation decomposition displacement
filtration neutralisation
[1]
(b) Write the word equation for this reaction.
[1]
© UCLES 2023 0893/02/A/M/23

13
(c) Look at the list of metals and solutions.
Tick ( ✓) to show if the metal reacts with the solution.
copper + iron nitrate
magnesium + zinc nitrate
silver + magnesium nitrate
iron + zinc nitrate
[2]

14
11 Lily investigates which type of insulation is best at reducing the transfer of thermal energy from
hot water.
Look at the diagram of Lily’s experiment.
thermometer
hot water
insulation (cardboard, newspaper or bubble wrap)

glass beaker
bench
Look at her results.
cardboard newspaper bubble wrap
time temperature time temperature time temperature

in seconds in seconds in seconds
0 83 0 85 0 85
60 67 60 81 60 81
120 75 120 79 120 79
180 71 180 76 180 77
240 68 240 72 240 75
300 65 300 68 300 73
(a) The unit of temperature is missing from the tables.
Write down the unit of temperature.
[1]
(b) Calculate the decrease in temperature in the 300 seconds for each beaker.
cardboard
newspaper
bubble wrap
[1]
© UCLES 2023 0893/02/A/M/23

15
(c) Before the investigation, Lily predicts,
‘Bubble wrap is the best insulator.’
Is her prediction correct?
[1]
(d) In one of Lily’s results tables, there is an anomalous result.
Circle the anomalous result in the table.
[2]
(e) Lily improves her investigation.
Suggest two improvements Lily makes to her investigation.
[2]

16
12 Mike investigates the reaction between magnesium and dilute hydrochloric acid.
Look at part of the equipment he uses.
dilute hydrochloric acid

magnesium
(a) Write down the name of the equipment Mike uses to collect the gas and measure the
volume of the gas.
[1]
(b) Mike measures the volume of gas made every 30 seconds until the reaction stops.
Describe how Mike makes his results more reliable.
[1]
(c) Mike writes a risk assessment for his investigation.
Write down one safety risk and describe how Mike reduces this risk.
safety risk
how Mike reduces this risk
[2]
© UCLES 2023 0893/02/A/M/23

17
BLANK PAGE

18
BLANK PAGE
© UCLES 2023 0893/02/A/M/23

19
BLANK PAGE

© UCLES 2023
Group
1 2 3 4 5 6 7 8
1 2
H He
hydrogen helium
Key 1 4
11 12 13 14 15 16 17 18
23 24 27 28 31 32 35.5 40
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
39 40 45 48 51 52 55 56 59 59 64 65 70 73 75 79 80 84
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
20
85 88 89 91 93 96 – 101 103 106 108 112 115 119 122 128 127 131
55 56 57–71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
0893/02/A/M/23
lanthanoids
133 137 178 181 184 186 190 192 195 197 201 204 207 209 – – –
87 88 89–103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
actinoids
– – – – – – – – – – – – – – – – –
57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
139 140 141 144 – 150 152 157 159 163 165 167 169 173 175
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103
– 232 231 238 – – – – – – – – – – –


 SCIENCE 1113/02

 Paper 2 April 2022

 45 minutes


 You must answer on the question paper.


INSTRUCTIONS
Answer all questions.
Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
Write your name, centre number and candidate number in the boxes at the top of the page.
Write your answer to each question in the space provided.
Do not use an erasable pen or correction fluid.
Do not write on any bar codes.
You should show all your working in the booklet.
You may use a calculator.
INFORMATION
The total mark for this paper is 50.
The number of marks for each question or part question is shown in brackets [ ].

IB22 05_1113_02/7RP
2
1 Draw one line from each cell drawing to its correct function.
Draw only five lines.
cell drawing function
makes sugar using

photosynthesis
contracts to cause
movement
joins with an egg

egg
pollinates the stigma

of a flower
detects changes
in the surrounding
surroundings
s
absorbs water
and minerals
transports
oxygen
[4]
© UCLES 2022 1113/02/A/M/22

3
2 Pierre reacts metal compounds and acids to make three different salts.
The table shows the metal compounds and the acids Pierre uses.
(a) Complete the table to show the salts the reactions make.
metal compound acid salt made
calcium carbonate nitric acid
sodium hydroxide sulfuric acid
potassium hydroxide hydrochloric acid
[3]
(b) When calcium carbonate reacts with nitric acid a gas is made.
Write down the name of this gas.
[1]

4
3 This question is about the Sun and the Moon.
(a) Why does the Sun appear to move across the sky?
[1]
(b) The Sun is a source of light.
(i) Describe how we see the Sun.
[1]
(ii) Write down the name of another source of light in space.
[1]
(c) The Moon is not a source of light.
Explain why we see the Moon.
[1]
© UCLES 2022 1113/02/A/M/22

5
4 The diagram shows six stages in the life cycle of a pea plant.
The stages are not in the correct order.
A B C
NOT TO SCALE D E F
Write the letters to show the stages in the

t he correct order.
Two of the stages have been done for you.
B D
[2]

6
5 The table shows the properties of solids, liquids and gases.
(a) Complete the table.
arrangement of particles movement of particles
solid
liquid close together
gas move quickly
[2]
© UCLES 2022 1113/02/A/M/22

7
(b) This diagram shows two gas jars that have just been joined together.
gas jar containing air
gas jar containing

a brown gas
This diagram shows the two gas jars 10 minutes later.
both gas jars

contain a pale
brown gas
(i) Name the process

process that happens during the 10 minutes.
[1]
(ii) Describe how the process happens.
Use ideas about particles.
[1]

8
6 Chen investigates how much a ruler bends when he adds different objects.
no object object added
table
clamp
ruler
distance ruler
bends after
A object added
object
He adds the objects at position A.
He writes his results in a table.
distance ruler bends

weight of object
after object added
in N
in cm
0 0.0
1 2.1
2 4.0
3 6.1
4 8.2
(a) (i) Describe what happens

happens as the weight
weight of the object increases.
increases.
[1]
(ii) Explain why this happens.
[1]
© UCLES 2022 1113/02/A/M/22

9
(b) Chen repeats the investigation.

investigation.
He moves the object closer to the clamp.
The object has a weight of 2 N.
(i) Predict the distance the ruler will bend.
cm [1]
(ii) Explain your prediction in (b)(i)

(b)(i)..
Use ideas about the principle of moments in your answer.
[2]

10
7 The diagram shows the human respiratory system.
A
D
C B
(a) (i) Circle the letter on the diagram that identifies the diaphragm
diaphragm.. [1]
(ii) Write down one function of the diaphragm.
[1]
(b) (i) Write down one function of the air sacs (alveoli) inside the lungs.
[1]
(ii) Describe one way the air sacs are adapted for their function.
[1]
© UCLES 2022 1113/02/A/M/22

11
8 The diagram shows an atom of hydrogen.
The nucleus contains only one particle.
(a) Complete the labels on the diagram.
.....................................
nucleus containing
..........................................................
[2]
(b) Write down the chemical symbol for hydrogen. [1]

12
9 Yuri investigates why the size of the leg of an elephant is different from the size of the leg of a horse.
5000 kilograms 500 kilograms NOT TO SCALE
Yuri makes model legs of both animals.
He uses modelling clay to make different-sized cylinders.

cylinders.
Yuri places one cylinder on a desk.
He places 100 g masses on top of this cylinder until the cylinder starts to squash and
change shape.
force
100 g mass
modelling clay cylinders
Yuri tests two different diameters of cylinder.
(a) The cylinders

cylinders are all cut to the same
same length.
length.
Explain why this is important.
[1]
© UCLES 2022 1113/02/A/M/22

13
(b) What equipment does Yuri use to measure the diameter of the cylinders?
[1]
(c) Yuri uses two cylinders for each diameter.
Explain why using two cylinders is important.
[1]

14
10 Wind is an energy resource.
wind turbines
(a) Wind turbines supply energy.
Suggest two disadvantages of using wind turbines.
[2]
(b) People in many countries are

are trying to increase the number of wind turbines.
Suggest why.
[2]
© UCLES 2022 1113/02/A/M/22

15
11 Gasoline burns in oxygen to make carbon dioxide and water.
Circle two words that describe this reaction.
displacement
endothermic
exothermic
neutralisation
oxidation
respiration
rusting
[2]
12 The diagram shows fungi growing on a piece of wood.
Fungi are decomposers.

decomposers.
What are decomposers?
Why are decomposers important?
[2]

16
13 The diagram shows five arthropods.
These arthropods all have jointed legs.
V W X
Y Z
NOT
NOTTO
TO SCALE
SCALE
Look at the key.

arthropods with jointed legs
has three pairs of legs has four pairs of legs
insects arachnids
does not
have has
wings has a
curved does
havenot
a
wings tail curved tail
has one has two

pair of pairs of
wings wings
Formica Calliphora Aeshna Scorpio Argiope
© UCLES 2022 1113/02/A/M/22

17
Use the key to find the names of arthropods V, W

W,, X
X,, Y and Z.
Write your answers in the table.
name letter
Aeshna
……………………..
Argiope
……………………..
Calliphora
……………………..
Formica
……………………..
Scorpio
……………………..
[2]

18
14 Lily investigates water pressure.
(a) Water is inside a container with holes in one side.
A hole
B
water
C
Where is the water pressure the greatest

greatest??
A B C D E
[1]
(b) Water is inside a different shaped container.
F G H
water
Compare the water pressure at F, G and H.
[1]
© UCLES 2022 1113/02/A/M/22

19
15 Potassium is an element in Group 1 of the Periodic Table.
(a) Look at the

the word equation.
potassium + water potassium hydroxide + hydrogen
Write down the name of one product of this reaction.
[1]
(b) Look at the order of the elements in Group 1 of the Periodic Table.
Li lithium
Na sodium
potassium
Rb rubidium
Cs caesium
Fr francium
(i) What is the chemical symbol for potassium?
K N Na P Po
[1]
(ii) Predict which Group 1 element reacts the fastest with water. [1]

20
16 Angelique measures
measures the temperature
temperature of three samples
samples of water.
The diagrams show her results.
0 40
10
–10 30
0
–10 –20 20
thermometer A thermometer B thermometer C
Record the temperature of each thermometer in the table.
thermometer temperature
in C
[2]
Assessment International
International Education Copyright
Copyright Acknowledgements Booklet.
Booklet. This is produced for each series of
of examinations and is fre
freely
ely available to dow
download
nload
at www.cambridgeinternational.org
www.cambridgeinternational.org after the live examination series.
Local Examinations Syndicate (UCLES), which is a department of the U niversity of Cambridge.
© UCLES 2022 1113/02/A/M/22


SCIENCE 1113/01
45 minutes

INSTRUCTIONS
INFORMATION
IB21 10_1113_01/9RP
2
1 The table describes some parts of the circulatory system.
Complete the table.
part function
artery carries blood from the heart
heart
allows exchange of substances between blood and organs
vein
[3]
© UCLES 2021 1113/01/O/N/21

3
2 The diagram shows a cooling curve for a pure substance.

gas
liquid
temperature
in C X
freezing solid
time
in minutes
(a) Which word describes the process X on the cooling curve?
boiling condensing evaporating melting [1]
(b) Describe two things that happen to the particles of the substance during freezing.
[2]
(c) A solid is heated until it becomes a gas.

Sketch a graph to show how the temperature changes during this process.
Use the axes provided.
temperature
in C
time
in minutes
[2]

4
3 Look at the diagram of the Sun and eight planets.
Sun H
G
B C D F
A
E
NOT TO SCALE
(a) Which letter represents the Earth? [1]
(b) Which letter represents the planet that takes the longest time to orbit the Sun?
[1]
(c) Which letter represents the largest planet in the Solar System? [1]
(d) Write down the names of planets B, F and H.
H
[1]
© UCLES 2021 1113/01/O/N/21

5
4 This cactus lives in a hot and dry desert.
stem
spines
sand
root
(a) The cactus has long roots that spread out in the sand.
(i) Suggest how the roots help the cactus survive in the hot and dry desert.
[1]
(ii) Explain one other way the cactus is adapted to living in the hot and dry desert.
[1]
(b) The cactus is eaten by kangaroo rats.
The kangaroo rats are eaten by snakes.
Desert foxes feed on snakes.
Complete the food chain for these organisms.
[2]

6
5 Jamila makes zinc sulfate.
She uses an acid and zinc metal.
The diagram shows the stages Jamila uses to make zinc sulfate.
The stages are not in the correct order.
heat
heat the filtrate to concentrate the solution
filter the reaction mixture
add excess zinc to the acid then gently heat
dry the zinc sulfate crystals with filter paper
leave the filtrate to evaporate slowly
© UCLES 2021 1113/01/O/N/21

7
(a) Put the stages in order to show the correct method.
A
[2]
(b) Write down the name of the acid Jamila uses to make zinc sulfate.
[1]
(c) When Jamila adds zinc to the acid a gas is made.
Write down the name of this gas.
[1]

8
6 Oliver investigates how the number of lamps in a circuit affects the current.
He connects the lamps in series.
He uses identical lamps.
Oliver writes his results in a table.
number current
of lamps in A
1 6.0
2 3.0
3 2.8
4 1.5
5 1.0
(a) Draw a graph of the results by:
• labelling the number of lamps on the x-axis

• labelling the current on the y-axis
• plotting all the points.
[3]
(b) Complete the graph by:
• putting a circle around the anomalous result

• joining the other points with a smooth curve. [2]
(c) Describe two patterns in his results.
2
[2]
© UCLES 2021 1113/01/O/N/21

9
7 This question is about growing tomato plants.
(a) (i) Write down the name of the process in tomato plants which uses carbon dioxide.
[1]
(ii) Write down the name of the two products of this process.
and [2]
(iii) State one reason why this process is important for animals.
[1]
(b) Tomato plants need to absorb mineral salts.
(i) Write down the name of the part of a plant that absorbs mineral salts.
[1]
(ii) Describe how mineral salts are transported in plants.
[1]

10
8 Aiko investigates the reaction of magnesium with hydrochloric acid.
The diagram shows her equipment.
X
delivery tube
bowl
25 cm3 of hydrochloric acid water

and
excess magnesium ribbon
(a) Aiko uses the equipment labelled X to measure the volume of gas made in the reaction.
Write down the name of equipment X.
[1]
(b) Aiko collects 35 cm3 of gas in 5 minutes.
Aiko wants to find out what happens when the concentration of acid is increased.
Aiko doubles the concentration of acid she uses and repeats the experiment.
(i) Predict the volume of gas she collects in 5 minutes.
cm3
[1]
(ii) Write down two variables she controls.
2
[2]
(c) Aiko wants to do a similar investigation with sodium and hydrochloric acid.
Explain why it would not be safe to use sodium.
[1]
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11
9 Look at the picture of a toad near a pond where it lives.
Humans also live near the pond.
(a) Toads reproduce by laying their eggs in water.
Suggest two ways human activities reduce the population of toads in the pond.
[2]
(b) Toads are vertebrates.
They have lungs and a moist skin.
Complete this sentence about toads.
amphibians birds fish mammals reptiles
Toads belong to a group of vertebrates called . [1]
(c) Complete this sentence about toads.
All the toads in the pond reproduce together to produce fertile offspring.
This means the toads in the pond all belong to the same . [1]

12
10 Blessy races four snails, A, B, C and D.
A
B
C
D
She draws a distance/time graph for each of the four snails.
distance
in cm
time
in minutes
(a) The distance of the race is 50 cm.
Which snail wins the race?
A B C D [1]
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13
(b) Which snail does not move for part of the race?
A B C D [1]
(c) Which snail moves the fastest between 1 minute and 2 minutes?
A B C D [1]
(d) What is the average speed of snail D over 5 minutes?
4 cm / minute 5 cm / minute 8 cm / minute 40 cm / minute [1]

14
11 Complete these sentences about the structure of the Earth.
At the very centre of the Earth is the .
This is surrounded by a layer of magma called the .
On top of the magma is the Earth’s outer layer called the .

[3]
12 The picture shows a fossil of a fish.
Fossils are often destroyed when metamorphic rock forms.
Explain why.
[1]
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16
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Cambridge Assessment International Education is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of the University of
Cambridge Local Examinations Syndicate (UCLES), which itself is a department of the University of Cambridge.
© UCLES 2021 1113/01/O/N/21


SCIENCE 1113/02
45 minutes
INSTRUCTIONS
INFORMATION
IB21 10_1113_02/8RP
2
1 This question is about cells, tissues and organs in plants and animals.
(a) Complete the table.
Tick () the box that describes each part.
part of plant cell tissue organ
leaf
palisade mesophyll
root hair
[2]
(b) Complete the table.
Tick () the box that describes each part.
part of animal cell tissue organ
sperm
stomach
heart
[2]
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3
2 This question is about elements and compounds.
(a) Match the name of the element to its correct chemical symbol.
element chemical symbol
B
beryllium
Be
boron
Br
[1]
(b) Look at the formula of this compound.
NaCl
The compound contains two elements.
One element is chlorine.
Write down the name of the other element.
[1]
(c) Look at the formula of this compound.
CaO
What type of compound is CaO?
carbonate hydroxide oxide sulfate

[1]

4
3 This question is about energy transfer processes.
(a) Draw a line from each method of energy transfer to its example.
method of energy transfer example
The way the air above a heater

becomes warm.
radiation
The way energy from the Sun

reaches the Earth.
convection
The way the metal handle of a

cooking pot gets hot.
[1]
(b) The diagram shows a copper rod being heated.
Explain how heat is transferred through the copper rod.
Use ideas about particles in your answer.
[3]
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5
4 Weeds reduce the growth of crops.
Rajiv is testing a new weed killer to reduce the number of weeds.
He wants to find the correct concentration of weed killer to kill weed seedlings.
He uses cotton wool soaked in weed killer solution.
The cotton wool is placed in a dish containing some weed seedlings.
weed seedlings
dish
cotton wool soaked

in weed killer solution
Rajiv does five different experiments.
In each experiment he uses a different concentration of weed killer solution.
(a) (i) State one variable he changes in each experiment.
[1]
(ii) State two variables he controls in each experiment.
2
[2]
(iii) State two variables he measures in each experiment.
2
[2]
(b) Suggest why Rajiv washes his hands after handling the cotton wool soaked in weed killer.
[1]

6
5 Priya has two magnets.
N S
N S
bar magnet horseshoe magnet
(a) Priya dips the bar magnet into iron filings.
Where will most of the iron filings stick to the magnet?
[2]
(b) Look at the horseshoe magnet.
Put an X on the diagram to show where the magnetic field is strongest.

[1]
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7
(c) Which pattern shows the magnetic field lines of a bar magnet?
N S N S
A B
N S N S
C D
Choose from A, B, C or D.
answer [1]

8
6 Carlos investigates the pH of some liquids.
Some of the liquids are very acidic and some are very alkaline.
(a) Describe how Carlos measures the pH of the liquids.
[1]
(b) Some of the liquids are dangerous to use.
Write down one safety precaution Carlos takes during his investigation.
Explain why this safety precaution is needed.
[2]
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9
7 Mike owns a group of sheep that he uses to produce wool.
He wants to increase the amount of wool his sheep produce.
He mates his female sheep with a different variety of male sheep.
(a) What term describes this way of producing a new variety of sheep?
[1]
(b) The diagram shows Mike’s female sheep and three different varieties of male sheep.
female sheep
male A male B male C
Which one of the three varieties of male sheep should Mike mate with his female sheep to
increase the amount of wool his sheep produce?
variety
reason
[1]

10
8 Look at the model of a carbon atom.
particle X
proton
particle Y
(a) Write down the name of:
particle X
particle Y
[2]
(b) Circle the name of the scientist who suggested a model for an atom.
Copernicus Galileo Newton Pasteur Rutherford [1]
(c) The diagram shows part of the Periodic Table.
1 2
H He
3 4 5 6 7 8 9 10
Li Be B C N O F Ne
11 12 13 14 15 16 17 18
19 20
K Ca
(i) Complete the sentence.
Carbon is in Period of the Periodic Table.

[1]
(ii) Circle the element which has similar chemical properties to carbon.
Ar Al B Li Si [1]
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11
9 Look at the diagrams of some sound waves.
A B
C D
You can use each letter once, more than once, or not at all.
(a) Which wave has the highest frequency? [1]
(b) Which wave shows the quietest sound? [1]
(c) Which wave shows the lowest pitch? [1]
(d) Which two waves have the same amplitude? and [1]

12
10 During breathing, air passes into the alveoli (air sacs) of the lungs, and is then released back into
the atmosphere.
Look at the table.
It shows the composition of inhaled air (air we breathe in) and exhaled air (air we breathe out).
gas percentage in inhaled air percentage in exhaled air

carbon dioxide 0.04 4
nitrogen and other gases 80 80
oxygen 20 16
(a) Describe the differences between the composition of inhaled air and exhaled air.
[2]
(b) Explain what happens in the alveoli to cause these differences between inhaled and
exhaled air.
[2]
(c) Air enters the human respiratory system through the nose and nasal cavity.
Write down two other parts that inhaled air moves through before it reaches the alveoli.
and [1]
© UCLES 2021 1113/02/O/N/21

13
11 The table describes the reaction of some metals with cold dilute acid and cold water.
reaction with reaction with

metal
cold dilute acid cold water
potassium reacts violently reacts very rapidly
lithium reacts violently reacts very rapidly
calcium reacts violently reacts very rapidly
extremely slow
magnesium reacts rapidly
reaction
metal X reacts slowly no reaction
copper no reaction no reaction
gold no reaction no reaction
Use information from the table to answer these questions.
(a) Explain how you can tell that magnesium reacts faster with cold dilute acid than with cold
water.
[1]
(b) Suggest the name of metal X.
[1]
(c) Potassium reacts with cold water to make a colourless gas and an alkaline solution.
Write the name of the:
colourless gas
alkaline solution
[2]

14
12 Complete the table to show the colour each object appears in different colours of light.
colour of light colour of object colour the object appears
white red
green green
blue red
[2]
13 Blessy uses pure white light to produce a spectrum of colours.
equipment X
red
orange
yellow
white light green
blue
indigo
violet
(a) What is the name of the process that splits white light into a spectrum of colours?
[1]
(b) Write down the name of equipment X.
[1]
© UCLES 2021 1113/02/O/N/21

15
14 Look at the list of energy sources.
Tick () the two renewable energy sources.
coal
hydroelectric
oil
natural gas
solar
[2]
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16
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
SCIENCE 1113/01
Paper 1 April 2021
45 minutes
INSTRUCTIONS
INFORMATION
IB21 05_1113_01/6RP
2
1 Look at the diagram. It shows part of the alimentary canal.
E C
(a) Where is acid added to the alimentary canal?
A B C D E [1]
(b) Where is digested food absorbed from the alimentary canal into the blood?
A B C D E [1]
(c) Look at the part labelled A on the diagram.
Write down the names of the two parts of the alimentary canal that part A connects.
and [1]
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3
2 Look at the descriptions of three rocks, A, B and C.
Rock A is formed in layers. It is soft and contains fossils.
Rock B is made when molten rock cools. It is hard and contains crystals.
Rock C is very hard. It contains distorted fossils due to high temperatures and high pressures.
(a) Complete the sentences to name each type of rock.
igneous metamorphic sedimentary
Rock A is rock.
Rock B is rock.
Rock C is rock.
[2]
(b) Describe how sedimentary rock is formed.
[2]

4
3 Some objects in the Universe are seen because they emit light.
Other objects are seen because they reflect light.
(a) Tick () the boxes next to the objects that emit light.
Jupiter
Mars
the Sun
North Star
the Earth’s Moon

[2]
(b) Which scientist first suggested that the planets in our Solar System orbit the Sun?
Copernicus Darwin Galileo Rutherford [1]
(c) Which of these planets is closest to the Sun?
Earth Jupiter Neptune Venus [1]
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5
4 The diagram shows the shells of five molluscs labelled A, B, C, D and E.
A B C D E
NOT TO SCALE
Use the key to identify the scientific names of the five molluscs.
shell consists of one single part go to 2

1
shell consists of two parts go to 3
shell is spiral-shaped mollusc is Buccinum

2
shell is not spiral-shaped mollusc is Patella
shell is long and thin mollusc is Ensis

3
shell is not long and thin go to 4
shell has a small tuft of hairs mollusc is Mytilus

4
shell does not have a small tuft of hairs mollusc is Ostrea
Write your answers in the table.
scientific name letter

Buccinum
Ensis
Mytilus
Ostrea
Patella
[2]

6
5 The diagram shows part of the Periodic Table.
1 2
H He
3 4 5 6 7 8 9 10
Li Be B C N O F Ne
11 12 13 14 15 16 17 18
19 20
K Ca
The number above each chemical symbol shows the number of protons in the atom.
(a) How many protons are there in an atom of sodium? [1]
(b) How many electrons are there in an atom of oxygen? [1]
(c) Look at the diagram of an atom.
.....................................
.....................................
.....................................
(i) Write down the chemical symbol for this atom.
[1]
(ii) Label the diagram.
electron neutron proton [1]
© UCLES 2021 1113/01/A/M/21

7
6 Blessy has two sound wave oscilloscope traces.
trace A trace B
(a) Circle the correct answers.
Which trace has the higher pitch?
trace A trace B they have the same pitch
Which trace has the lower frequency?
trace A trace B they have the same frequency
Which trace is louder?
trace A trace B they have the same loudness
Which trace has the lower amplitude?
trace A trace B they have the same amplitude

[3]
(b) Sound waves are produced by a vibrating object.
What does the vibrating object do to the air particles around it?
[1]

8
7 Look at the diagram of four different varieties of the same species of chicken.
A B
C D
A farmer uses selective breeding to produce a new variety of chicken.
This new variety of chicken must be black with white spots and have a large tail.
Describe two stages in the production of this new variety of chicken.
[2]
© UCLES 2021 1113/01/A/M/21

9
Question 8 starts on the next page.

10
8 Carlos investigates the reaction between magnesium and hydrochloric acid.
Look at the diagram. It shows the apparatus he uses.
Carlos measures the total volume of gas made every 30 seconds.
(a) Look at the diagram of the gas syringe below.
10 20 30 40 50 60 70 80 90 100 cm3
What is the volume of gas in the gas syringe?
cm3 [1]
(b) Carlos decides to repeat his experiment.
Suggest why it is a good idea to repeat the experiment.
[1]
(c) The hydrochloric acid in the experiment is corrosive.
Describe how Carlos controls this safety risk.
[1]
© UCLES 2021 1113/01/A/M/21

11
(d) Look at his results.
time in seconds total volume of gas in cm3
0 0
30 20
60 35
90 44
120 50
150 50
Circle the best way for Carlos to present his results.
bar graph line graph pie chart scatter graph [1]
(e) The total volume of gas made depends on the concentration of acid.
Carlos wants to do an experiment that makes about 100 cm3 of gas.
Describe how he decides the correct concentration of acid to use.
[1]

12
9 Mike has four copper containers.
He puts water into each container.
He puts all the containers in a classroom at 20 °C for 10 minutes.
A B C D
Mike draws this table about the containers.
temperature of
outside surface of volume of water
container water at start
container in cm3
in °C
A dull 100 60
B shiny 100 60
C dull 100 70
D dull 100 60
(a) Mike compares container A with container B.
The water cools faster in A than in B.
(i) Complete the sentence.
The difference between the two containers is
. [1]
(ii) Complete the sentence.
boiler conductor freezer radiator
The water cools faster in container A because the container is a better
. [1]
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13
(b) Mike compares container C with container A.
The water cools faster in C than in A.
Why does the water cool faster in C than in A?
[1]
(c) Mike compares container D with container A.
The water cools faster in D than in A.
Suggest why.
[1]

14
10 Look at the picture of an elephant.
large ears
tusk
trunk
(a) Elephants are adapted to survive.
Draw a line to match each adaptation with the reason why it helps the elephant survive.
adaptation reason
large ears pull grass from ground
trunk keep elephant cool
used to fight other

tusks
elephants
[1]
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15
(b) The chart shows the population of elephants in different parts of Africa in 1981 and 1989.
500
400
300 1981
population of
elephants 1989
in thousands 200
100
0
West Africa East Africa South Africa Central Africa
location
(i) In which part of Africa was the largest decrease in the population of elephants between
1981 and 1989?
[1]
(ii) Humans caused the changes in elephant populations between 1981 and 1989.
Suggest two ways humans caused these changes.
[2]

16
11 Look at the diagrams. They show the arrangement of particles in solids, liquids and gases.
Look at the statements about solids, liquids and gases.
A are usually hard
B take the shape of the container they are put into
C can be compressed (squashed)
D completely fill any container they are put into
E have a fixed shape
F cannot flow easily
(a) Complete the table by putting the letter for each statement into the correct column.
One letter has been done for you.
solids liquids gases
[3]
(b) Liquids can evaporate.
Explain what happens to the particles in a liquid during evaporation.
[2]
© UCLES 2021 1113/01/A/M/21

17
12 The diagram shows part of a flower that is pollinated by bees.
stigma
anther
anther
petal
The male and female parts of the flower are protected by petals.
(a) Write down one other function of the petals.
[1]
(b) Write down one function of the anther.
[1]
(c) The diagram shows a bee pollinating this flower.
(i) Describe what happens during pollination.
[1]
(ii) Describe what happens after pollination.
[2]

18
13 Mia is a dancer.
The force she exerts on the floor is 500 N.
(a) She stands with both feet flat on the floor.
force = 500 N
The area of her shoes in contact with the floor is 400 cm2.
Calculate the pressure she exerts on the floor.
pressure N / cm2 [2]
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19
(b) Mia stands on the points of her feet.
Her new area of contact with the floor is 10 cm2 rather than 400 cm2.
force = 500 N
Describe what happens to the pressure she exerts on the floor.
[1]
(c) Mia balances on one point.
force = 500 N
She cannot remain on one point for a long time because it may damage her toes.
Suggest why this may damage her toes.
[1]
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20
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
SCIENCE 1113/02
Paper 2 April 2021
45 minutes
INSTRUCTIONS
INFORMATION
IB21 05_1113_02/7RP
2
1 Yuri draws a picture of a fungus living near some trees.
After three days he draws another picture of the same fungus.
Look at these two pictures.
day 1 day 4
(a) The pictures show evidence that this fungus is a living organism.
What is this evidence?
[1]
(b) Yuri’s teacher says that there are more characteristics of living organisms.
Write down three other characteristics of living organisms.
3
[3]
© UCLES 2021 1113/02/A/M/21

3
2 These varieties of cat belong to the same species.
Siamese cat Manx cat
(a) Complete this definition of a species.
Animals that belong to the same species are able to together
to produce offspring.
[2]
(b) Siamese cats and Manx cats show variation within a species.
Describe two differences, shown in the diagram, between Siamese cats and Manx cats.
[2]

4
3 This question is about different types of chemical reaction.
(a) Complete the sentences.
combustion displacement neutralisation respiration rusting
(i) Burning a fuel in air is called . [1]
(ii) The reaction between an acid and an alkali is called . [1]
(b) Complete the word equation for the reaction between calcium carbonate and hydrochloric acid.
calcium hydrochloric calcium

+ + +
carbonate acid chloride
[2]
© UCLES 2021 1113/02/A/M/21

5
4 Look at the diagram. It shows white light being split into different colours.
t
te li gh
w hi
Complete the sentences.
dispersion eight filter mirror
prism reflection refraction screen
seven six spectrum
When white light enters a it is split into
different colours.
This process is known as .
The different colours are known as the colours of the .

[4]

6
5 This question is about elements, compounds and mixtures.
(a) Look at the boxes. They show the particles in some substances.
A B C D
Which box shows a mixture of two elements?
A B C D
[1]
(b) A compound is made of only sodium and chlorine.
What is the name of this compound?
[1]
© UCLES 2021 1113/02/A/M/21

7
6 Mia measures the current in different electrical circuits.
(a) Write down the name of the piece of equipment used to measure current.
[1]
(b) Mia connects an electrical circuit with one cell and two lamps.
A1 0.125 A A3
A2
The reading on A1 is 0.125 A.
Write down the two missing readings.
The reading on A2 is A.
[1]
(c) Mia connects three more circuits using the same size cells and lamps.
A4 0.25 A A5 A6
The reading on A4 is 0.25 A.
Write down the two missing readings.
[2]

8
7 Chen measures the pulse rate of his friends before and after exercise.
All the friends do the same amount and level of exercise.
pulse rate before exercise pulse rate after exercise change in pulse rate
friend in beats per minute in beats per minute in beats per minute
Carlos 74 104
Mike 72 105
Oliver 69 98
(a) Calculate the change in pulse rate for each friend.
Write your answers in the table. [1]
(b) Are Chen's results reliable?
Yes No
[1]
(c) Chen makes this statement.
‘Mike is the fittest boy in my school.’
Write down two reasons why Chen's statement is not correct.
[2]
© UCLES 2021 1113/02/A/M/21

9
8 Look at the diagram. It shows solutions being mixed in a plastic cup.
thermometer
lid
plastic
cup
mixture of
solutions
Look at the table. It shows the results of five experiments.
temperature before temperature after

experiment mixing solutions mixing solutions
in °C in °C
A 15 26
B 15 10
C 15 15
D 15 32
E 15 27
(a) (i) Which experiment transfers the most thermal (heat) energy into the solutions?
[1]
(ii) Complete the sentence.
The reaction in experiment is endothermic because
. [1]
(b) Suggest a reason for the result in experiment C.
[1]

10
9 Priya measures the distance a swimmer moves every five seconds.
She investigates two different swimming styles.
She writes her results in a table.
distance in m
time in s
butterfly style backstroke style
0.0 0.0 0.0
5.0 8.5 9.0
10.0 16.5 18.0
15.0 25.0 34.5
20.0 33.0 35.0
25.0 42.0 46.0
(a) One of the results is anomalous.
Circle the anomalous result in the table. [1]
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11
(b) (i) Complete the distance/time graph for the butterfly style:
• label the x-axis and y-axis
• plot the other three points
• draw a line of best fit.
50.0
40.0
30.0
.........................................
20.0
10.0
0
0 5.0 10.0 15.0 20.0 25.0
.........................................
[3]
(ii) Predict the distance the swimmer moved in the first 12 seconds.
m [1]

12
10 The diagram shows the heart of a human.
The darker grey shading shows oxygenated blood.
A
B
heart
C
Use the information in the diagram to match each letter with the correct description of the
blood vessel.
letter description of the blood vessel
artery taking deoxygenated blood

A
to the lungs
artery taking oxygenated blood

B
to the body
vein taking deoxygenated blood

C
to the heart
vein taking oxygenated blood

D
to the heart
[3]
© UCLES 2021 1113/02/A/M/21

13
11 Look at the chemical symbols for four metals.
Cu Zn Na Ca
Answer the questions.
Each chemical symbol can be used once, more than once or not at all.
(a) Which of the four metals is the most reactive?
[1]
(b) Which of the four metals does not react with water or dilute hydrochloric acid?
[1]
(c) Which of the four metals reacts slowly with dilute hydrochloric acid?
[1]
(d) Which of the four metals is lowest in the reactivity series?
[1]

14
12 Safia draws two pie charts to show the energy resource use in her country.
oil
natural gas
coal
nuclear
renewables
Year 2018 Year 2040
The pie chart for the year 2040 shows the predicted energy resource use.
The predicted natural gas use decreases from 2018 to 2040.
The predicted renewables use increases from 2018 to 2040.
(a) Describe two other changes in predicted energy resource use from 2018 to 2040.
[2]
(b) (i) Name one renewable energy resource.
[1]
(ii) Suggest why the renewable energy resource use is predicted to increase from 2018 to
2040.
[1]
© UCLES 2021 1113/02/A/M/21

15
13 Angelique investigates how quickly plants absorb water.
She uses the stem and leaves of a plant called celery.
She puts a stem of celery in a jar of coloured water.
After one hour she looks at the celery to see how much coloured water it has absorbed.
This is shown in the diagram.
leaves
coloured water
absorbed
celery stem
jar
coloured
water
at start after one hour
(a) Suggest how Angelique measures the amount of coloured water the celery has absorbed.
[1]
(b) Angelique also investigates the effect of temperature on the absorption of water.
State two variables that Angelique controls in this investigation.
2
[2]

16
14 Carlos researches the solubility of different salts.
He finds this information on the internet.
Most sulfates All potassium

are soluble in and sodium salts
water (except are soluble
barium, calcium in water.
and lead).
Most chlorides All nitrates are

are soluble in soluble in water.
water (except lead
and silver).
Use the information to answer these questions.
(a) Write down the name of one insoluble sulfate.
[1]
(b) Look at the chemical formula of a salt.
KCl
Is the salt soluble?
Yes No
[1]
© UCLES 2021 1113/02/A/M/21


SCIENCE 1113/01
45 minutes
INSTRUCTIONS
INFORMATION
This document has 20 pages. Blank pages are indicated.
IB20 10_1113_01/6RP
2
1 Complete the crossword puzzle about cells.
3 4
Across
2 Which rigid structure surrounds a plant cell?
4 What is the name of a group of different tissues working together?
5 Which structure contains the genetic material in a cell?
Down
1 What is the name of the structure inside a cell where photosynthesis happens?
2 Where in a cell do most chemical reactions happen?
3 What is the name of a group of similar cells?

[4]
© UCLES 2020 1113/01/O/N/20

3
2 An oscilloscope displays sound waves.
(a) Draw a line to match each display to the correct change.
display change
decrease in
frequency
decrease in
loudness
increase in
amplitude
increase in
pitch
[3]
(b) Tick () the correct sentence about the amplitude of sound.
A high-amplitude sound must be a high-frequency sound.
A high-amplitude sound must be a high-pitch sound.
A high-amplitude sound must be a loud sound.
A high-amplitude sound must be a low-frequency sound.
A high-amplitude sound must be a sound with a large wavelength.

[1]

4
3 Look at the diagram of a volcano.
smoke and ash
lava
main
vent
outer layer
of the Earth
magma
chamber
(a) Lava from the volcano cools down to make rock.
Which type of rock is made when lava cools down?
[1]
(b) Rock that forms from lava does not contain fossils.
Explain why.
[1]
(c) What is the name of the outer layer of the Earth?
crust inner core mantle outer core

[1]
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5
(d) The sentences are about the internal structure of the Earth.
Tick () the correct sentence.
The crust floats on the outer core.
The inner core is solid and the outer core is liquid.
The mantle is the coldest part of the Earth.
The outer core is the hottest part of the Earth.

[1]

6
4 The diagram shows a food web.
lion
jackal
wild
goat
cat
rabbit
grass
vole
(a) Which animals in this food web are eaten by the wild cat?
and [1]
(b) Write a complete food chain that includes the goat and two other animals.
[1]
(c) The number of voles decreases.
Explain how this may affect the number of rabbits.
[1]
(d) Energy is lost from food webs.
Write down one way energy is lost from a food web.
[1]
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5 The diagram shows some information about metals.
sodium
react with
cold water
lithium
magnesium react with

acids
zinc
react with
lead oxygen
copper
gold
(a) Use the diagram to answer these questions.
(i) Which metal reacts with oxygen but not acid?
[1]
(ii) Describe two ways in which the reactions of magnesium and zinc are similar.
[2]
(b) Sodium is placed in cold water. It reacts to form a gas.
What is the name of this gas?
[1]

8
6 Carlos investigates light.
(a) He shines blue light into a prism.
blue
light
prism
(i) Describe one thing that happens to the blue light.
[1]
(ii) Carlos changes the blue light to white light.
Describe one other thing that happens to the white light.
[1]
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(b) Carlos shines light through different coloured filters onto different colours of a book.
coloured filter
light source
book
Complete his results table.
colour of light reflected

colour of light colour of book
into eye
red red
blue red
red magenta
[2]

10
7 Angelique’s pet mouse has baby mice.
Pierre says that grouping together helps the baby mice to keep warm.
Angelique suggests that they plan an investigation to test Pierre’s idea.
They use eight test-tubes filled with hot water to represent eight baby mice.
Angelique labels one tube A and stands it on its own.
She labels another tube B and places it in the middle of six other tubes all labelled C.
tube B
tube A
tube C
Pierre and Angelique obtain these results.
time in minutes
0 1 2 3 4 5
temperature of water in tube A in oC 73 62 54 38 42 40
temperature of water in tube B in oC 73 68 65 62 58 57
temperature of water in tube C in oC 73 65 59 54 49 47
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(a) Describe two patterns shown by these results.
[2]
(b) Describe how these results could be displayed to make these patterns more obvious.
[1]
(c) Angelique says that one result is anomalous.
Which result is anomalous?
tube time minutes
Explain how you know the result is anomalous.
[2]
(d) Baby mice do not have fur.
Angelique thinks that mice lose less heat when they grow fur.
Describe an investigation, using test-tubes of hot water, to see if Angelique’s idea is correct.
[2]

12
8 The diagram shows molecules in a mixture.
(a) Tick () the box next to the correct statement about the mixture.
mixture of four elements
mixture of four compounds
mixture of two elements and two compounds
mixture of one element and three compounds

[1]
(b) Molecules are made of atoms.
Atoms are made of three types of particles.
(i) Electrons are one of these types of particles.
What are the two other types of particles in an atom?
and [2]
(ii) Which scientist suggested a model for the atom?
Copernicus Darwin Galileo Rutherford

[1]
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9 Rajiv investigates the speed of a block of wood moving down a slope.
Here is his prediction.
‘I predict that the higher the slope, the faster the block of wood moves.’
low slope high slope

block of
wood
time distance travelled time distance travelled

in seconds by block in metres in seconds by block in metres
4 1.00 4 2.00
(a) Is Rajiv’s prediction true?
...........................................
Use Rajiv’s results to explain your answer.
[2]
(b) What two pieces of equipment does Rajiv need for the measurements he makes?
2
[1]
(c) He uses 4 seconds for both experiments.
What two other things are kept the same in his investigation to make it a fair test?
2
[2]

14
10 The picture shows a diver wearing breathing apparatus.
(a) The cylinder on his back is filled with gas.
The gas contains an element that the diver needs to survive under water.
Name this element.
[1]
(b) Gaseous exchange takes place in his lungs.
Explain what is meant by the term gaseous exchange.
[1]
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11 Jamila builds this electrical circuit.
direction switch 1
of
current
switch 2 X
A
switch 3
Y
(a) What type of electrical circuit is this?
electrostatic magnetic parallel series

[1]
(b) Jamila wants to turn lamp X on but leave lamp Y off.
What must she do?
[1]
(c) Jamila wants to turn lamp Y on but leave lamp X off.
What must she do?
[1]
(d) Jamila closes all the switches.
What happens to the current at point A?
[1]

16
12 Ahmed investigates the reaction between magnesium lumps and dilute hydrochloric acid.
Look at the diagram. It shows the apparatus he uses.
gas syringe
dilute
hydrochloric acid
magnesium
lump
Look at the graph of Ahmed’s results.
120
110
100
90
80
total 70
volume of
hydrogen 60
given off
in cm3 50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
time in seconds
(a) How long (in seconds) does it take to make 50 cm3 of hydrogen?
seconds [1]
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(b) Ahmed repeats the experiment with magnesium powder.
Predict what will happen to the rate of the reaction.
Explain why.
[3]
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
SCIENCE 1113/02
45 minutes
INSTRUCTIONS
INFORMATION
IB20 10_1113_02/8RP
2
1 The diagrams A, B, C, D and E show five different invertebrate animals.
A B
E
D
NOT TO SCALE
(a) (i) Which one of the animals is an insect?
Choose from A, B, C, D or E.
[1]
(ii) Which one of the animals is an arachnid?
[1]
(b) Which one of the animals is not an arthropod?
[1]
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2 This question is about the three states of matter.
(a) A gas is blown into a balloon. The balloon changes shape.
Why does the balloon change shape?
Tick () the box next to the correct answer.
The particles of the gas expand to fill the space.
The particles of the gas get bigger.
The particles of the gas hit the surface of the balloon more often.
The particles of the gas slow down.

[1]
(b) Rajiv investigates the cooling curve of a substance.
He measures the temperature of a hot liquid every minute.
The graph shows his results.
90
80
70
60
temperature 50
in °C
40
30
20
10
0
0 1 2 3 4 5 6 7 8
time in minutes
(i) What is the temperature of the hot liquid at the start?
°C [1]
(ii) Name the process that happens when a liquid changes into a solid.
[1]
(iii) At what temperature does the liquid change into a solid?
°C [1]

4
3 Complete the sentences about thermal (heat) energy transfer.
conduction convection radiation
Thermal (heat) energy can be transferred from one place to another place.
When particles are involved, the processes are and .
When electromagnetic waves are involved, the process is .

[2]
4 Look at the list of different energy sources.
wood sugar coal
OIL
LPG
OIL
OIL GAS
OIL
crude oil propane sunflower oil

(petroleum) (LPG)
Which three of these energy sources are non-renewable?
3
[1]
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5 Complete the sentences about changes that happen in the human body during adolescence.
Choose words or phrases from the list.
at the same time as body hair breasts earlier than
enzymes hormones later than proteins
During adolescence, the human body begins to change.
Both sexes begin to grow .
This is due to the increased amount of made by the sex organs.
On average, females become sexually mature males.

[3]
6 Chen investigates some reactions.
He measures the temperature of the reactants at the start of the reaction.
He measures the temperature of the products at the end of the reaction.
Look at his results.
temperature at temperature at temperature

reaction start end change type of reaction
in °C in °C in °C
A 20 15 −5 endothermic
B 20 30
C 15 30
D 25 15
(a) Complete the table. [2]
(b) Which reaction has the greatest energy change?
Explain how you know.
[2]

6
7 Mia and Blessy sit on a balanced seesaw.
1.0 m 1.5 m
Mia Blessy
Blessy has a weight of 400 N.
Calculate the weight of Mia.
weight of Mia N [2]
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8 Some plants live in dry places where there is very little rainfall.
(a) These plants often have a large network of roots.
Describe two different functions of roots.
2
[2]
(b) When it is dry, resurrection plants are rolled up.
In wet conditions, resurrection plants unroll and flatten out.
This exposes the plant’s leaves and reproductive organs.
leaves
reproductive
organs
Explain why these changes are important to the resurrection plant’s survival.
(i) Unrolling to expose its leaves.
[2]
(ii) Unrolling to expose its reproductive organs.
[2]

8
9 Lily investigates the boiling points of some liquids.
(a) She uses a Bunsen burner to heat 20 cm3 of each liquid in a beaker.
Which equipment should Lily use to measure the boiling point of the liquid?
[1]
(b) Write down one safety precaution that Lily should take.
[1]
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10 Mike explains that different materials have different densities.
He says,
‘Materials that are less dense than water will float.
Water has a density of 1 g / cm3.’
He finds out the densities of different materials.
material density in g / cm3
gold 19.3
plastic 1.05
pumice stone 0.251
silver 10.5
wood 0.715
(a) Predict which two materials will float.
Choose from the table.
and [1]
(b) Mike collects some water from the sea.
He tries to float the materials from the table in the seawater.
Now three of these materials float.
Use information from the table to explain why.
[2]

10
11 The seeds of cereal plants provide food for humans.
The diagram shows five varieties of a cereal plant.
A B C
produces lots of seeds small leaves does not need much water
D E
long stems shallow roots
Scientists want to produce a new variety of this cereal plant.
This cereal plant must:

• provide lots of food
• survive in dry conditions.
(a) Which two plants should the scientists use to produce the new variety of cereal plant?
Choose from A, B, C, D, and E.
and [1]
(b) Describe what the scientists do to produce the new variety.
[2]
(c) Name the process scientists use to produce new varieties of plants and animals.
[1]
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12 Look at the picture of an iron pipe.
The iron has reacted with water and a gas in the air to form hydrated iron oxide.
(a) What word describes this reaction?
[1]
(b) Which gas in the air reacts with the iron?
[1]
(c) This reaction is not useful.
Explain why.
[1]

12
13 Safia finds information about renewable energy resources used in a country for the years 2012
and 2014.
year 2012 year 2014
geothermal solar geothermal solar

wind
wind
biomass
biomass
hydroelectric
hydroelectric
(a) Estimate the percentage of renewable energy provided by biomass in 2012.
% [1]
(b) The percentage of the renewable energy resources used changed from 2012 to 2014.
Which percentage increased the most?
biomass
geothermal
hydroelectric
solar
wind
[1]
(c) The energy needs of the world are increasing.
Why is it important to develop renewable energy resources?
[1]
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13
14 Look at the diagram.
It shows part of the Periodic Table.
H He
Li Be B C N O F Ne
K Ca transition elements
(a) Write down the chemical symbol of an element in the same group as chlorine.
[1]
(b) Write down the chemical symbol of an element in the same period as sodium.
[1]
(c) Write down the chemical symbol of the element with an atom with only 8 protons.
[1]
(d) Complete the diagram to show the electronic structure of lithium, Li.
[1]

14
15 The boxes show some ideas about the Solar System.
(a) Match each idea to the correct scientist.
Draw only two lines.
ideas scientist
Galileo
The first scientist to suggest that the planets

orbited the Sun. Rutherford
Copernicus
Built a telescope and looked at Jupiter and its

Pasteur
moons. This showed that everything does not
rotate around the Earth.
Darwin
[2]
(b) Here is a list of bodies found in the Solar System.
Earth Mars Moon Sun
Which one of these bodies is visible because it emits light?
[1]
(c) Which two of these bodies are visible because they reflect light?
Mars Moon North Star Sun
and [1]
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16 Aiko and Oliver investigate thermal (heat) energy.
They heat a copper rod covered in wax.
Here is the apparatus they use.
copper rod
covered in wax
wood peg
paper clips in
the wax
heat
wood block
wood bench
When the copper rod is hot, the wax melts and the paper clips fall onto the bench.
(a) Aiko removes the copper rod. Oliver tells her to be careful.
Complete the sentences.
Aiko must be careful because .
When she removes the copper rod, she uses .

[1]
(b) Here are the results.
distance of paper clip from heat time for paper clip to fall
in cm in seconds
6 3.2
7 4.3
8 5.4
9 6.6
10 7.9
Aiko says it is a good idea to repeat the experiment.
Explain why this is a good idea.
[1]
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
SCIENCE 1113/01
Paper 1 April 2020
45 minutes
INSTRUCTIONS
 Answer all questions.
 Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
 Write your name, centre number and candidate number in the boxes at the top of the page.
 Write your answer to each question in the space provided.
 Do not use an erasable pen or correction fluid.
 Do not write on any bar codes.
 You should show all your working in the booklet.
 You may use a calculator.
INFORMATION
 The total mark for this paper is 50.
 The number of marks for each question or part question is shown in brackets [ ].
IB20 05_1113_01/3RP
2
1 The list contains the names of different parts of a cell.
cell membrane
cell wall
chloroplast
Complete the table by placing ticks () in the correct boxes.
where the part of the cell is found

part of a cell only in animal only in plant in both animal
cells cells and plant cells
cell membrane
cell wall
chloroplast
[2]
2 This question is about the properties of metals.
(a) Draw straight lines to match the property of a metal with its correct use linked to that
property.
property of a metal use
drill bit
sonorous
bridge across a river
strong
electrical wires
ductile
bell
hard
[2]
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3
(b) Metals are used to make electrical wires because they conduct electricity.
plastic
metal
Write down two reasons why plastic is put around electrical wires.
[2]
(c) Read the sentences about the physical properties of metals.
Tick () the box next to the correct sentence.
All metals have low melting points.
Some metals are gases at room temperature.
All metals conduct heat.
All metals are brittle.

[1]

4
3 Blessy uses the internet to find out about our Solar System.
She finds a very old model of our Solar System.
Jupiter
Mars
Mercury
orbits
Earth
Moon
Venus
Sun
Saturn
Scientists thought that the Earth was at the centre.
The orbits in the old model show the other objects moving around the Earth.
(a) Scientists today know that the Earth is not at the centre of our Solar System.
What is at the centre of our Solar System?
[1]
(b) Write down two other things that are incorrect in the old model.
2
[2]
(c) Write down one thing that is correct in the old model.
[1]
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5
4 This question is about blood vessels.
(a) Draw a straight line from each cross section of a blood vessel to the correct letter showing
where the blood vessel is found.
blood vessels
cross sections
of blood vessels A
from heart
direction
of blood flow
B
C
to heart
[2]
(b) Name the types of blood vessel labelled A and C.
[2]

6
5 The picture shows three different elements and their state at room temperature.
solid iodine liquid bromine chlorine gas
(a) Which two of these elements flow easily at room temperature?
[1]
(b) What is the chemical symbol for chlorine?
[1]
(c) Chlorine gas fills the jar.
Explain why a gas fills a jar.
Tick () the box next to the correct explanation.

Forces between the particles push them apart.


The particles are free to move.


The particles can easily be squashed into a small space.


The particles increase in size to fill the space.
[1]
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(d) Liquid bromine easily evaporates.
Explain what happens to the particles (molecules) when a liquid evaporates.
[2]

8
6 Mia investigates sound.
oscilloscope
loudspeaker
microphone
She makes a sound using a loudspeaker.
The sound is detected by the microphone.
(a) Describe how the sound travels from the loudspeaker to the microphone.
[2]
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9
(b) Mia draws the wave she sees on the oscilloscope.
(i) She makes the sound louder.
Draw this wave on the oscilloscope.
[1]
(ii) She makes the sound a higher pitch.
Draw this wave on the oscilloscope.
[1]

10
7 This question is about the life cycle of a plant.
(a) These processes take place in the life cycle of a plant.
fertilisation pollination seed formation seed germination
Put the processes in the order in which they occur in the life cycle of a plant.
seed
germination
.................... .................... ....................
[1]
(b) The diagrams A and B show two different types of seed.
A B
Suggest the method of dispersal for each type of seed.
Give a reason for each answer.
method of seed dispersal reason
[2]
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11
8 Look at the diagram of the structure of a lithium atom.
nucleus
(a) There are three electrons in a lithium atom.
(i) How many protons are there in a lithium atom?
[1]
(ii) How many neutrons are there in a lithium atom?
[1]
(b) A sodium atom contains 11 protons.
Draw the structure of a sodium atom.
[2]

12
9 Mike investigates the strength of magnets.
magnet
hand
paper clip
Mike
 puts the magnet on top of his hand
 puts the bottom of his hand onto 24 paper clips
 lifts his hand up
 counts how many paper clips have been attracted
 repeats with different magnets.
magnet number of paper clips
A 24
B 24
C 7
D 19
E 12
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13
(a) Mike concludes that magnet A and magnet B are both strong.
He cannot conclude which of these two magnets is stronger.
(i) Explain why he cannot conclude which magnet, A or B, is stronger.
[1]
(ii) Describe what he could do to find out which magnet, A or B, is stronger.
[1]
(b) Pierre repeats Mike’s investigation.
Here are Pierre’s results.
magnet number of paper clips
A 18
B 22
C 1
D 13
E 6
Pierre uses the same magnets as Mike.
Pierre uses the same paper clips as Mike.
The results are different.
(i) Describe one difference between the results.
[1]
(ii) Suggest why the results are different.
[1]

14
10 Egg white contains a protein.
An enzyme digests protein in the stomach.
Class 9 investigate how changing the pH affects the time it takes for the enzyme to digest egg
white.
The graph shows the results of their investigation.
10
6
time to
digest egg 5
white in
minutes 4
0
0 1 2 3 4 5 6
pH of mixture
(a) (i) Which pH has the shortest time of digestion?
pH [1]
(ii) The class want to be certain that they have found the shortest time.
Describe two things the class does to be certain.
[2]
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15
(b) (i) State one safety risk of using liquids with a very low pH.
[1]
(ii) Describe one way of reducing this safety risk.
[1]
(c) State one variable the students must control in this investigation.
[1]

16
11 Jamila and Ahmed investigate displacement reactions.
They put drops of different solutions into the dimples of a spotting tile.
They then add metals to each solution.
The diagram shows their experiment.
zinc magnesium copper iron

metal metal metal metal
dimple
zinc nitrate
solution
magnesium nitrate
solution
Key
copper nitrate
solution
empty dimple
iron nitrate
solution dimple with
metal and solution
spotting tile
(a) Jamila and Ahmed look to see if a reaction takes place.
Suggest what they might see if a reaction takes place.
[1]
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(b) They record their results in a table.
They put a
 tick () if there is a reaction

 cross (x) if there is no reaction.
Here are some of their results.
metal
solution
zinc magnesium copper iron
zinc nitrate  x x
magnesium nitrate
copper nitrate   
iron nitrate   x
(i) Complete the table to predict the results for magnesium nitrate. [1]
(ii) The reactivity series shows the metals in order of reactivity.
Which of the four metals is the lowest in the reactivity series?
[1]

18
12 Complete the light rays in the three diagrams.
(a) reflection
mirror
normal
[1]
(b) refraction
air
water
[1]
(c) shadow formation
screen
light source
opaque
object [2]
13 Complete the word equation for aerobic respiration.
.................... .................... ....................

glucose + +
.................... .................... ....................
[2]
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
SCIENCE 1113/02
Paper 2 April 2020
45 minutes
No additional materials are required.
INSTRUCTIONS
 Answer all questions.
 Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs.
 Write your name, centre number and candidate number in the boxes at the top of the page.
 Write your answer to each question in the space provided.
 Do not use an erasable pen or correction fluid.
 Do not write on any bar codes.
 You should show all your working in the booklet.
 You may use a calculator.
INFORMATION
 The total mark for this paper is 50.
 The number of marks for each question or part question is shown in brackets [ ].
IB20 05_1113_02/3RP
2
1 A farmer breeds goats for their milk.
(a) The farmer uses selective breeding.
These are the steps he uses.
They are in the wrong order.
A He breeds the female goat with a male goat.
B He repeats the steps for several generations.
C He chooses a female goat that produces a lot of milk.
D He breeds the female offspring with a male goat.
E He chooses a female offspring that also produces a lot of milk.
Put the steps in the correct order.
E
[2]
(b) The characteristic the farmer chooses in his female goats is producing lots of milk.
Suggest one other characteristic the farmer wants in his goats.
[1]
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3
(c) Natural selection is the way new varieties of animals form in the wild.
Which scientist developed the idea of natural selection?
Copernicus
Darwin
Galileo
Pasteur
Rutherford
[1]

4
2 Aiko wants to increase the rate of reaction between sodium carbonate and dilute nitric acid.
(a) Match the way that she can do this to why it works.
Draw only two straight lines.
way why it works
more crowded particles so more collisions

increase the
temperature of
nitric acid
particles have less energy so more collisions
particles move faster so more collisions

increase the
concentration of
nitric acid
has bigger particles so that there are more collisions
[2]
(b) Lumps of sodium carbonate react more slowly with dilute nitric acid than powdered sodium
carbonate.
Use ideas about collisions to explain why.
[2]
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3 Chen and Yuri draw a distance / time graph for their journeys.
Chen
120
110
100
90
Yuri
80
70
distance
60
in metres
50
40
30
20
10
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
time in seconds
Use the distance / time graph to answer the questions.
(a) How many metres did Chen move in the first 8 seconds? m [1]
(b) How many seconds did Yuri stop moving during his journey? s [1]
(c) Average speed can be calculated from the graph.
(i) Complete the equation for average speed.
average speed =
[1]
(ii) Calculate Yuri’s average speed during the whole journey.
Yuri’s average speed m/s [2]

6
4 (a) Look at the picture of a camel.
Camels live in hot dry deserts.
They have many adaptations to help them survive.
Complete the table to explain how a camel’s adaptations help it survive.
The first one has been done for you.
adaptation explanation
fat in hump only so that the rest of the body has less insulation
large flat feet

………………………………………………………….
thick eyelashes
………………………………………………………….
does not
produce sweat ………………………………………………………….
[3]
(b) Animals that live in the cold have different adaptations.
Suggest two adaptations that help animals survive in the cold.
[2]
© UCLES 2020 1113/02/A/M/20

7
5 Mike makes a salt called magnesium sulfate.
He adds magnesium to dilute sulfuric acid.
magnesium o o oo
ribbon dilute
sulfuric acid
He keeps adding magnesium to the dilute sulfuric acid until no more hydrogen gas is given off.
Some unreacted magnesium is left in the magnesium sulfate solution.
(a) Describe how Mike separates the unreacted magnesium from the magnesium sulfate
solution.
[1]
(b) Describe how Mike makes a dry sample of magnesium sulfate from magnesium sulfate
solution.
[1]
(c) Write a word equation for the reaction between magnesium and sulfuric acid.
+ +
[2]

8
6 Lily and Angelique use the internet to find this information about evaporation.
Evaporation can happen when liquids are hot or cold.
Evaporation is related to the energy of molecules.
The rate of evaporation can change.
rate of rate of
evaporation evaporation
air pressure energy of molecules
(a) What happens to the rate of evaporation when the air pressure increases?
[1]
(b) (i) What happens to the rate of evaporation when the energy of molecules increases?
[1]
(ii) Write down one way the energy of molecules could be increased.
[1]
© UCLES 2020 1113/02/A/M/20

9
7 Water and minerals move through flowering plants.
(a) Complete the sentences about how water and minerals move through a plant.
Choose parts of a plant from the list.
Each part can be used once, more than once or not at all.
palisade mesophyll phloem root hair xylem
Water and minerals enter plants through the cells.
The water and mineral solution is transported in the stems through
cells.
The solution reaches the cells in the leaves and

is used for growth. [3]
(b) Plants need water to make sugar.
Name two other things that plants need to make sugar.
and
[2]

10
8 The diagram shows different types of rocks and how they form.
igneous volcanic magma

rock eruption
sediment
rock X
sedimentary rock
(a) Sedimentary rocks can be turned into rock X by heat and pressure.
What type of rock is X?
[1]
(b) Which layer of the Earth contains magma?
atmosphere inner core mantle outer core

[1]
(c) Sedimentary rocks often contain the remains of dead animals and plants from millions of
years ago.
What word is used to describe these remains?
[1]
© UCLES 2020 1113/02/A/M/20

11
(d) Different types of soil have different amounts of organic matter in them.
Which type of soil contains the most organic matter?
clay loam sandy silt
[1]

12
9 Sound can be reflected in the same way as light.
Safia and Yuri investigate the relationship between the angle of incidence, x, and the angle of
reflection, y.
They use the apparatus in the diagram.
board
tube A x y tube B
11 12 1
10 2
9 3
8 4
7 6 5 ticking clock
sound
meter
board
Yuri
 puts the ticking clock next to tube A
 puts the sound meter next to tube B
 uses the same value for angle x
 uses different values of angle y.
Safia writes down the sound level shown on the sound meter.
Complete the table about the variables.
variable to change
1. ………………………….…………….......
1. value for x
variables to control 2. ………………………….…………….......
3. ………………………….…………….......
variable to measure
1. ………………………….…………….......
[4]
© UCLES 2020 1113/02/A/M/20

13
10 Look at the diagrams of cells.
cheek cell red blood cells nerve cell
(a) Describe one way the structure of a nerve cell is different to a cheek cell.
[1]
(b) The structure of a red blood cell is adapted for its function.
Explain how.
function
adaptation
[2]

14
11 Mia investigates the temperature change during some reactions.
In each experiment Mia adds a solid to a liquid.
She measures the temperature of the liquid before and after adding the solid.
(a) Mia uses a measuring cylinder to measure the volume of liquid.
The diagram shows part of her measuring cylinder of liquid.
cm3
4
What is the volume of liquid in the measuring cylinder?
cm3 [1]
© UCLES 2020 1113/02/A/M/20

15
(b) Here are Mia’s results.
temperature is the reaction

temperature
liquid of the liquid change in exothermic
of solid(s) added
added after solid is temperature or
liquid
added endothermic?
water 17 copper sulfate 20 +3

………….
citric acid and sodium

water 17 14
hydrogencarbonate
…………. ………….
copper
sulfate 18 zinc 22
solution
…………. ………….
(i) She does not include some important information in the headings of the table.
Which unit is missing from the headings?
[1]
(ii) Calculate the change in temperature for each experiment.
Write your answers in the table. [1]
(iii) Complete the table by writing endothermic or exothermic in the last column. [1]

16
12 Some objects become electrically charged.
(a) Oliver draws a diagram of two charged objects.
plastic rod – –
–
– – – + +
– – +
+ + cloth
– +
+
+
+
Explain how the objects become charged.
[2]
(b) Complete the sentences.
Opposite charges .
Like charges . [1]
© UCLES 2020 1113/02/A/M/20

17
(c) Oliver puts charged balloons next to each other.
A B C D
Balloon A has a positive charge.
What are the charges on the other balloons?
A is positive.
B is .
C is .
D is . [1]
13 Diagrams are used to show how energy is transferred.
Lamps transfer energy.
electrical energy = 100 J

...................energy = 10 J
thermal energy = 90 J
Complete the diagram to show the type of energy that is 10 J. [1]
© UCLES 2020 1113/02/A/M/20

18
BLANK PAGE
© UCLES 2020 1113/02/A/M/20

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Cambridge Lower Secondary Checkpoint

You must answer on the question paper.

No additional materials are needed.

This document has 20 pages. Any blank pages are indicated.

1 The arrows show the pathway of water through the root.

(a) Name the type of root cell labelled A.

(b) Suggest one way root cell A is adapted to its function.

Use the diagram to help you.

(d) Vessel B transports minerals to the leaves.

Name the mineral needed to make chlorophyll.

© UCLES 2023 0893/01/O/N/23

2 Safia has a solution of copper sulfate.

Use labelled diagrams to help you with your description.

© UCLES 2023 0893/01/O/N/23 [Turn over

3 Heat and temperature are different.

a measure of how cold something is

a measure of how hot something is

a measure of the thermal energy of a substance

(b) Measurements of temperature in °C can be positive, negative or zero.

Use ideas about the three states of matter in your answer.

© UCLES 2023 0893/01/O/N/23

4 This question is about the carbon cycle and climate change.

(a) Complete the carbon cycle diagram.

Choose words from the list.

combustion decomposition feeding

fossil fuels NOT TO SCALE

(b) Describe what happens during decomposition.

(c) The main cause of climate change is burning fossil fuels.

Describe one effect of climate change.

© UCLES 2023 0893/01/O/N/23 [Turn over

A scientific study has shown that the mass

So, I think the mother should be careful

So, I don’t think it matters what

(a) Who has made a more informed decision?

Tick (✓) one box.

Explain your answer.

Write down one other factor that affects fetal development.

© UCLES 2023 0893/01/O/N/23

Write down one other possible effect of this collision.

(b) Carlos models an asteroid colliding with the Earth.

He drops a steel ball into a box containing sand.

© UCLES 2023 0893/01/O/N/23 [Turn over

7 Waveforms show how sound waves interact.

Look at the different waveforms.

(a) Waveform B is the result of the interaction between two waveforms.

Which word describes this interaction?

(b) Look at this diagram showing two waveforms.

(c) Look at this diagram showing two waveforms.

© UCLES 2023 0893/01/O/N/23

8 (a) Chen investigates the inheritance of sex in humans.

Explain why bag A represents male gametes.

(i) Look at the table of his results.

The table is not complete.

colour of ball from colour of ball from male or female

Chen’s results do not show a value of 50%.

© UCLES 2023 0893/01/O/N/23 [Turn over

9 Sodium is in Group 1 of the Periodic Table.

Sodium reacts with chlorine to form an ionic compound.

Why is a sodium ion positively charged?