Name: ___________________________________________ Adm No: ________Class: ___
BIOLOGY REV ONE.
Instructions to Candidates
ANSWER ALL QUESTIONS
1. Give the function of the following parts of a light microscope. (2 marks)
i. Diaphragm.
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ii. Condenser.
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2. Plasmodium vivax and Plasmodium ovale are transmitted by a mosquito. State with a reason whether two
organisms can interbreed. (2 marks)
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3. Name the organelles that perform each of the following functions: (2marks)
a) Digestion and destruction of worn-out organelles.
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b) Osmoregulation
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4. An experiment was set up as shown in the diagram below.
The set-up was left for 30 minutes.
a. Name the process that is being investigated. (1mark)
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b. State the expected results. (2marks)
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c. Explain your answer in (a) above. (2marks)
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5. The action of ptyalin stops at the stomach. Explain. (2marks)
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6. In an experiment to investigate a factor affecting photosynthesis, a leaf of a potted plant which had been kept
in the dark overnight was covered with aluminum foil as shown in the diagram below,
The set up was kept in the sunlight for three hours after which a food test was carried out.
a. Which factor was being investigated in the experiment. (1 mark)
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b. Why was it necessary to keep the plants in the darkness before the experiment? (1 mark)
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c. What food test was carried out. (1 mark)
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d. State the results of the food test. (1 mark)
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e. Account for the results in (d) above. (1 mark)
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7. Explain how age as a factor determine the daily energy requirement in human. (2 marks)
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8. The diagram below represent skull obtained from an animal
i. State the special name given to the structures labelled L and M. (1 mark)
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ii. state the likely diet of the animal from which the skull was obtained. (1 mark)
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iii. Name the substance that is responsible for hardening of teeth. (1 mark)
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9. The diagram below shows how food boles move along the human oesophogus and the Intestine
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(a) Identify the process illustrated in the diagram. (1 mark)
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(b) Name one component of a person’s diet that assists in the movement of food bolus from position 1 to
position 2. (1 mark)
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10. Distinguish between transpiration and guttation. (2 marks)
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11. Name a disease that causes thickening and hardening of arteries. (1 mark)
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12. The diagram shows a section through a plant organ.
a. From which plant organ was the section obtained. (1 mark)
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b. Give two reasons form your answer in (a) above. (2 marks)
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c. How is the part labelled C adapted to its functions? (3marks)
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13. The diagram below represents an experiment that was used to investigate a certain process.
a) Name the process that was being investigated, (1mark)
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b) Account for the swelling in diagram 2. (2marks)
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14. State the functions of each of the following parts of the nervous system in control of the heart beat
I. The vagus nerve. (1mark)
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II. Sympathetic nerve. (1mark)
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15. The diagram below shows single circulation in a fish
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a. Write down the names of the parts labelled V and T. (2 marks)
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b. How is this type of circulation different from that found in man? (2 marks)
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c. Explain the main disadvantage of this type of circulation. (1 mark)
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16. Explain how red blood cells of mammals are adapted to their functions. (3 marks)
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17. The diagram below shows a vertical section through a mammalian heart
i. Name the parts labelled A, B, C and D. (4 marks)
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ii. Use arrows to show the direction in which blood flows out of the heart. (2 marks)
iii. Explain why left ventricle has thicker walls than right ventricle. (2 marks)
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iv. Give three structural differences between A and B. (3 marks)
A B
19. State two ways in which the heart muscles are special. (2 marks)
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20. (i) Name the type of circulatory system in insects. (1mark)
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(ii) Name the openings in the chamber of the heart of an insect. (1mark)
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21. Name the blood vessel that
i. Provides the liver with oxygenated blood. (1mark)
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ii. Nourishes the cardiac muscles of the heart. (1mark)
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22.State two functions of pericardium membrane. (2 marks)
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