1.

ATURAL SCIENCE
2. Choose the correct answer.
3. Plants lose water through transpiration. Which process is responsible for this?
a. Diffusion
b. Capillarity
c. Surface tension
d. Osmosis
4. Which of the following is produced during photosynthesis?
a. Oxygen and inorganic compounds
b. CO2 and H2O
c. Oxygen and H2O
d. Oxygen and organic compounds
5. How are ions formed?
a. By gaining or losing protons
b. By gaining or losing electrons
c. By sharing protons
d. By sharing electrons
6. Which of the following waves of visible light has the highest frequency?
a. Violet
b. Green
c. Indigo
d. Blue
7. Where is the earth located during a lunar eclipse?
a. Behind the moon
b. Between the sun and the moon
c. At a point of 180 degrees from north
d. Behind the sun
8. Which of the following parts can only be seen in plant cell?
a. Mitochondria
b. Nucleus
c. Lysosomes
d. Cell wall
9. Which of the following parts can only be seen in an animal cell?
a. Centrioles
b. Cell wall
c. Thylakoid
d. Chloroplast
10. How should conclusions be stated?
a. A form that can be evaluated by others
b. Completely correct, with no mistakes
c. Works with only 1 set of data
d. Cannot be refuted
11. What do you call that property of a moving object to continue moving in a straight line acted on
by outside force?
a. Acceleration
b. Velocity
c. Inertia
d. Speed
12. A car initially at rest accelerates in a straight line at 6 m. What will be its speed after 3 seconds?
a. 18 m/s
b. 0 m/s
 c. 9 m/s
d. 2 m/s
13. What is formed when elements are chemically combined?
a. Alloys
b. Nuclei
c. Mixture
d. Compounds
14. What is the formula for determining density of an object?
a. Mass plus volume
b. Mass divided by volume
c. Volume divided by mass
d. Mass times volume
15. Water has a higher specific heat than iron. What does this mean?
a. Water is hotter than iron
b. Water heats more rapidly than iron
c. Water is more dense than iron
d. Water heats more slowly than iron
16. Which of the following is responsible for heat transfer by radiation?
a. Atmosphere currents
b. Collision of particles
c. Electromagnetic waves
d. Molecular and electronic collision
17. Which of the following is true when an object is positively charged?
a. It has a deficiency of neutrons
b. It has an excess of neutrons
c. It has a deficiency of electrons
d. It has a deficiency of protons
18. If three light bulbs of different wattage are connected in series to a battery, which of the
following is true?
a. The resistance in each light bulb will be the same.
b. The current in each light bulb will be the same.
c. The light output in each light bulb will be the same.
d. The power consumed by the light in each light will be the same.
19. What absorbs a portion of the radiation from the sun preventing it from reaching the earth’s
surface?
a. Choloroflourocarbon
b. Hydroflourocarbon
c. Mesosphere
d. Stratosphere
20. Given the following electron configuration, determine the group number and period number of
the element. 1s22s22p63s23p64s2
a. Period 4, group 2
b. Period 2, group 5
c. Period 6, group 3
d. Period 6, group 2
21. which of the following is not a chemical reaction?
a. A. ripening of fruit C. freezing of water
b. B. rusting of metal D. burning of wood
22. What differentiates a eukaryotic cell from a prokaryotic cell?
a. A. presence of true nucleus C. presence of chromosomes
b. B. presence of cell membrane D. none of the above
23. What best describes a cold blooded animal?
a. They thrive in cold environment
b. Their body fluid temperature remains the same
c. They first order consumer
d. Their blood is cold
24. .Organisms may reproduce sexually, asexually, or both sexually and asexually. Which of the
following is an example of sexual reproduction?
a. A. vegetative reproduction C. fission
b. B. union of gametes D. budding
25. 25.During photosynthesis, plant produce food in the form of glucose, known as the end product
of photosynthesis. In what form do plants and other autotrophic organisms store food?
a. A. Root crops C. Rhizome
b. B. Fruits D. Starch
26. 26.Genes are known as the units of heredity because they carry the hereditary information from
generation to generation. What organic compound in the genes does this work?
a. A. Carbohydrates C. Proteins
b. B. Lipids D. Nucleic acid
27. 27.Which of the following is the correct sequence of the levels of organization in human body?
a)cells> tissues> organs> system
b) organs> tissue> system> cells
c)system> organs> tissue> cells
d) None of the above
28. 28.The following are insects except one. Which is not an insect?
a. A. mosquito C. spider
b. B. firefly D. ant
29. 29.Which of the following is true of inertia?
a)It is the tendency of an object at rest to remain at rest
b) It is the tendency of an object in motion t gain speed
c)It is the tendency of the moving object to change its directions
d) It is the tendency of matter to disintegrate.
30. 30.What is the hottest star?
a. A. Red C. yellow
b. B. blue D. white
31. 31.Which of the following are the three basic components of an atom?
a)protons, neutrons, ions
b) protons, neutrons, electrons
c)protons, electrons, ions
d) neutrons, electrons, ions
32. 32.Why does greenhouse effect result to warmer temperature near the surface of the earth?
a)Ozone traps ultraviolet radiation
b) carbon dioxide traps infrared radiation
c)clouds traps infrared radiation
d) soil absorbs incoming radiation
33. 33.Which two systems of yours work when you move your leg?
a)Immune and Excretory
b) nervous and muscular
c)digestive and respiratory
d) circulatory and integumentary
34. 34.Barometer - Air pressure:____________
a)Decibel- sound
b) Kilometer- Length
 c)Thermometer- Temperature
d) Odometer- Smell
35. 35.__________- Cancer: Cardiologist-___________
a)Geologist- Earth
b) Cardiologist- Urethra
c)Oncologist- Heart
d) Leukemia- Lymph Nodes
36. Which of the following is the functions of chloroplast? 2
a)Mitosis and Meiosis
b) cellular respiration
c)conversion of the light energy to chemical energy
d) Protein synthesis
37. 37 .It is observed that most leaves have fewer stomata on the upper surface than on the lower
surface. A greater number of stomata on the upper surface would result in ____________.
a)closing and opening of stomata on the lower surface
b) excessive loss of water
c)faster rate of photosynthesis
d) reduced transpiration
38. 38. A student placed some sliced of potato in a glass of drinking water. After a while she took a
few slices and found the slices very turgid. What can you infer from this observaton.
a)The slices became smaller
b) The potato slices did not change in shape
c)Water was absorbed by the potato
d) Water moved out of the tissues of potato
39. 39.In taxonomy, which classification is arranged from largest related groups to the smallest?
a)Species, genus, order, family, class, phylum, kingdom
b) Species, order,genus,family,class, phylum,kingdom
c)kingdom, Class, Phylum, Order, Family, Genus , Species
d) Kingdom, Phylum, Class, Order, Family, Genus, Species
40. 40.Which of these is the correct representation of the hierarchical organization of life from least
to most complex?
i. hydrogen, water, heart muscle cell, nucleus, heart muscle tissue, heart, human
ii. hydrogen, water, nucleus, heart muscle cell, heart muscle tissue, heart, human
iii. hydrogen, water, nucleus, heart muscle cell, heart, heart muscle tissue, human
iv. water, hydrogen, nucleus, heart muscle cell, heart muscle tissue, heart, human