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For Examiner's Use
Centre Number Candidate Number

Surname

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Question Mark
General Certificate of Education
1
Advanced Subsidiary Examination
June 2012 2

3
Biology BIOL2 4

Unit 2 The variety of living organisms 5

6
Monday 21 May 2012 1.30 pm to 3.15 pm
7…

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Answer all questions in the spaces provided.



1 (a) Flatworms are small animals that live in water. They have no specialised gas exchange
or circulatory systems.
The drawing shows one type of flatworm.




1 mm

1 (a) (i) Name the process by which…

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1 (b) (ii) Describe how carbon dioxide in the air outside a leaf reaches mesophyll cells inside
the leaf.

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(3 marks)
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7
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Turn over for the next question




Turn over



(03)
WMP/Jun12/BIOL2

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2 Sugar beet is a crop grown for the sugar stored in its root. The sugar is produced by
photosynthesis in the leaves of the plant. Plant breeders selected high-yielding wild
beet plants. They used these plants to produce a strain of sugar…

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2 (b) Sugar beet plants have been selected for a faster rate of growth.

Suggest how the faster rate of growth may increase profit for a farmer.

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(1 mark)

2 (c) Describe and explain how selection will have affected the…

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3 The diagram shows one end of a cellulose molecule.

H O O H H O O

Z H H O O H H
Bond Y

3 (a) (i) Name the monomers that form a cellulose molecule.

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(1 mark)

3 (a) (ii)…

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3 (b) (i) Complete the table to show two ways in which the structure of cellulose is different
from the structure of starch.


Starch Cellulose




(2 marks)




3 (b) (ii) Explain one way in which the structure of cellulose is linked to its…

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4 (a) Mitosis is important in the life of an organism. Give two reasons why.

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(2 marks)

A biologist used a microscope to investigate plant tissue where some of the cells were
dividing by mitosis. She examined 200…

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4 (b) (i) Explain why the biologist chose to examine 200 cells.

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(1 mark)

4 (b) (ii) Name Stage A and Stage B. Give the evidence from the photograph that you used to
identify the stage.

Name of Stage A…

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5 The diagram shows part of a DNA molecule.


C




D




E



5 (a) (i) DNA is a polymer. What is the evidence from the diagram that DNA is a polymer?

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(1 mark)

5 (a) (ii) Name the parts of…

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