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Biology Paper 2 Form 4 End of Term 2 Exams 2021

Class: Form 4

Subject: English

Level: High School

Exam Category: Form 4 End Term 2 Exams

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BIOLOGY
PAPER 2
END OF TERM 2 EXAM 2021

SECTION A (40 MARKS)
Answer all questions in this section

1 (a) The table below shows the concentration of sodium and iodine ions in pond water and in the cell sap.

Giving reasons name the process through which each of the ions is taken up by the plants
(i) Sodium ion (2mks)

(ii) Iodine ion (2mks)

(b) The lettuce plant was then treated with a chemical substance that inhibits the synthesis of ATP Giving a reason, state which ion was affected by the treatment (2mks)

(c) Explain why fresh water fish cannot survive is marine habitat (2mks)

2. The diagram below represents recycling of nutrients in a certain ecosystem

(a) Name the trophic level represented by Q (1mk)

(b) Name the process represented by: (3mks)
I
…………………………………………………
II
…………………………………………………
III
…………………………………………………
(c) Name the organism involved in process II (1mk)

(d) What would happen within the ecosystem if all the secondary consumers were eliminated? (3mks)

3. (a) what is non disjunction (1mk)

(b) Haemophilia is a sex linked trait
(i) If a normal woman but carrier for haemophilia marries a normal man, work out the phenotype of the offspring using a genetic cross (3mks)

(ii) Name two chromosomal disorders (2mks)

(c) Other then haemophilia, state any other two sex - linked defect in man (2mks)

4. An experiment was set to investigate the effect of unilateral light on the growth of oat coleoptiles. The diagram in the table represents the experimental set ups the start and the result at the end of experiment.

(a) Account for the reaction in experiment set up A (3mks)

(b) Explain the purpose of experiment set up B and C (3mks)

(c) Explain the results in the experiment set D and E (2mks)
D
…………………………………………
E
…………………………………………
5. The diagram below represents a transverse section through mammalian skin

(a) Name the structures A and B (2mks)
A……………………………………
B……………………………………
(b) (i) Explain how the hair in human beings helps in keeping the body warm (3mks)

(ii) Explain other methods by which the skin helps to keep the body warm (3mks)

SECTION B: (40MARKS)
Answer question 6 (compulsory) and either question 7 or 8 in the spaces provided.
6. The table below shows how the width of the stomata and the wind speed can affect the rate of transpiration from a leaf of a plant. The width are measured in micrometers (nm)

Biology Paper 2 Form 4 End of Term 2 Exams 2021

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