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Page 1

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SECTION A

Answer ALL questions in this section. Write your answers in the spaces provided in this answer
booklet.

1. (a) (i) In the space below make an annotated schematic drawing of a chloroplast.




[ 4 marks]

(ii) Identify and describe the TWO parts of the chloroplast that…

Page 2

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(b) Figure 1 is a diagram of the nitrogen cycle.


Gaseous nitrogen in atmosphere




A




B



Figure 1. Nitrogen cycle

(i) Identify the processes in Figure 1 represented by the letters A, B, C, D, E and F.

A

B

C

D

E

F
[ 3 marks]




GO…

Page 3

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(ii) Describe TWO NATURAL way _ ~t:;:t:~C:::::J::::'c -- 0 t from soil ecosystems.




[ 2 marks]

(iii) Describe TWO human activities which impact the nitrogen cy Ie.




[ 2 marks]

Total 15 marks




GO ON TO THE NEXT PAGE
02207020/CAPE120 10

Page 4

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~ 2 hows apparatus that was used to investigate the distribution of stomata on the
pper and lower part,s of a leaf.




I+---------Retort stand

Leafy shoot

-+-------++--------- Syringe containing water for pushing air
back to right-hand end of capillary tube

Rubber bung-----!
r Graduated capillary tube

/ Air
Water


Conical…

Page 5

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(iii) Suggest an appropriate control for the experiment.




[1 mark]

(b) Identify THREE factors that affect the closing and opening of stomata, and explain how
these factors function.




[3 marks]

(c) Figure 3 shows an electron micrograph of a plant structure .


...·
··· ·
"
··…

Page 6

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(ii) Discuss TWO structural differences between the cells labelled X and Y and
describe how, in spite of these differences, they function as a unit.




1'--




[ 4 marks]

(iii) Name ONE route by which substances move from the chloroplast in leaves to
the phloem.


[1 mark]

Total…

Page 7

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Infectious and non-infectious




Deficiency and inherited




[ 3 marks]

(iii) Explain the difficulty in classifying protein-energy malnutrition as a non- infectious,
physical, deficiency disease.




[ 3 marks]




GO ON TO THE NEXT PAGE
02207020lCAPE/20 10

Page 8

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(b) Figure 4 presents data on the number of deaths that occurred in women from laryngeal
and lung cancer and breast cancer for the period 1975-2005, in a country.




900

800

700
.:: .......·....................·...........
- Laryngeal
Number 600 A
-, .·................· and
~ -< ·
of .…

Page 9

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(ii) Suggest TWO reasons for the difference in the shapes of the curves.




[ 2 marks]

(iii) Outline TWO challenges that health authorities in the Caribbean may face in
reversing the trends for laryngeal and lung cancer.




[ 2 marks]

Total 15 marks




GO ON TO THE…

Page 10

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SECTIONB

Answer ALL questions. Write your answers in the spaces provided at the end of each question.

4. (a) (i) Explain what is meant by the term 'glycolysis' and state where it takes place in
the cell. [ 4 marks]

(ii) Aerobic respiration is represented by the…

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