CSEC Biology June 2013 P032
CSEC Biology June 2013 P032
CSEC Biology June 2013 P032
BIOLOGY
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2 hours u s
1. Answer A questions.
2. You are advised to take some time to read through the paper and plan your
answers.
3. Use this answer booklet when responding to the questions. For EACH question,
write your answer in the space provided and return the answer booklet at the
end of the examination.
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through it.
(a) The biologists set up a line transect to investigate the changing distribution of organ-
isms, two miles inland from the river bank on either side of the river. Describe how this
apparatus is to be used.
PDUNV
(b) The biologists also use a 1 m2 quadrat to investigate the distribution of different plant
species found within 100 m on either side of the river bank. Some of this data is given
in Table 1.
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1 2 3 4 5 6 7 8 9 10
Cactus species (Xerophytes) 1 10 12 10 12 1 10 12 10
Flowering shrubs 3 6 2 3 3 2 3 0
Ferns 3 22 20 2 2 2 1 2 30
(i) Calculate the species density of EACH of the three plant species using the data
in Table 1. Show your working in each case.
Cactus species
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
Flowering shrubs
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
Ferns
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
PDUNV
(ii) Suggest T O reasons why the number of ferns counted on the third throw of
the quadrat was so low, compared with the results obtained on the other throws.
_______________________________________________________________
_______________________________________________________________
PDUNV
(iii) Predict which of the three plant species would be found FURTHEST away from
the river bank and give a reason for your answer.
_______________________________________________________________
_______________________________________________________________
PDUNV
(c) A few of the organisms found in the area are shown in Figure 1.
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(i) Name ONE visible feature, other than wings, shown in the organisms in Figure
1, and complete Table 2 to classify the organisms into groups, using this visible
feature. PDUNV
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1.
______________________
___________________________________________________
2.
(ii) Describe the procedure which the biologists may have used to investigate the
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_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
PDUNV
(iii) State ONE precaution that should be taken when using the procedure described
in (c) (ii) above.
_______________________________________________________________
PDUN
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and small birds eat these larvae. Draw a simple pyramid in the space below to represent
this information.
PDUNV
(e) Give ONE reason why the biologists should OR should not encourage developers to
build houses in this area.
______________________________________________________________________
_____________________________________________________________________
PDUNV
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2. Forty-eight seeds are collected from fruits taken from the same dicotyledonous plant and the
seeds are weighed. The masses of the seeds range from 0.10 mg to 0.2 mg.
(a) Suggest why the seeds do NOT have exactly the same weight.
_____________________________________________________________________
PDUNV
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, of 2 seedlings each. The dry mass of three of the seedlings from each batch is deter-
mined.
(i) ist the apparatus and describe a suitable procedure for investigating the dry
mass of the seedlings.
Apparatus
_______________________________________________________________
Procedure
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
PDUNV
(ii) The remaining seedlings in atch are treated with varying amounts of organic
fertili er. Suggest a suitable aim for this investigation.
_______________________________________________________________
_______________________________________________________________
PDUNV
(iii) State which batch of seedlings would be considered the control, and give a reason
for your answer.
atch _________________________________________________________
Reason ________________________________________________________
________________________________________________________
PDUNV
(c) The average dry mass of three seedlings is determined over a 12-day period after
germination and recorded in Table 3.
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(i) For Day 1, the dry mass of the three seedlings in atch A is 0. , 0.7 and 0. mg
respectively, while the dry mass for the three seedlings in atch is 0. , 0.6 and
0. mg respectively.
Calculate the average dry mass of the three seedlings taken from EACH of the
batches and UHFRUG \RXUDQVZHULQ7DEOH.
Show your working.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
PDUNV
(ii) On the grid provided in Figure 2, plot a graph of the data in Table 3.
PDUNV
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(iii) Determine the average dry mass of the seedlings on Day , from the graph in
Figure 2.
atch A _______________________________________________________
atch _______________________________________________________
PDUNV
(iv) Explain the difference in the shape of the two graphs drawn in Figure 2.
_______________________________________________________________
_______________________________________________________________
PDUNV
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(a) (i) Make a labelled drawing of the gills in the space provided below.
PDUNV
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_______________________________________________________________
_______________________________________________________________
PDUNV
(b) Identify T O visible features of the gills drawn in (i) above that make them suited to
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_____________________________________________________________________
_____________________________________________________________________
PDUNV
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END OF TEST
IF YOU FINISH BEFORE TIME IS CALLED, CHECK YOUR WORK ON THIS TEST.
01207032/F 2013