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Biology Paper 1 Theory Question Paper

Biology Paper 1 Theory

Course:Secondary Level

Exam Year:2010

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Name__________________________________________________ Index No: _________________
231/1
BIOLOGY
THEORY
JUNE/AUGUST 2010
PAPER 1
2 HOURS
FORM FOUR MID-YEAR CONTINUOUS ASSESSMENT TEST
Kenya Certificate of Secondary Education
BIOLOGY
PAPER 1
THEORY
2 HOURS
INSTRUCTION TO CANDIDATES
Answer all the questions in the spaces provided
1-32 80
CANDIDATE SCORE
This paper consist of 9 printed pages
Please Turn Over
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1. State two properties of the cell membrane. (2mks)
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2. Outline two precautions taken during collection and observation of live specimens. (2mks)
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3. (a) What is the formula for calculating linear magnification using a light microscope. (1mk)
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(b) State two functions of centrioles. (2mks)
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4. Describe how diffusion gradient affects the rate of diffusion. (3mks)
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5. What is a guard cell? (2mks)
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6. State the specific sites in which the following reactions occur: (2mks)
(i) Light stage.
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(ii) Dark stage.
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7. Plants relatively have less waste to excrete than animals. Giving two reasons to explain this
Observation. (2mks)
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8. (a) Name the gap in the lower jaw of a herbivore that facilitate movement of the tongue
during chewing. (1mk)
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(b) Name two substances absorbed into the blood from the stomach in man. (2mks)
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9. (a) Give two reasons why lower organisms such as bacteria and simple multicellular
Organisms do not have an elaborate transport system. (2mks)
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(b) Explain how the shape of erythrocytes helps it to function efficiently. (1mk)
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10. Explain leaf fall as a factor affecting transpiration rate. (3mks)
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11. List three structures where gaseous exchange occurs in amphibians. (3mks)
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12. State two causes of Asthma. (2mks)
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13. Give two factors affecting the rate of respiration. (2mks)
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14. (a) Aerenchyma tissues and pneumatophores are found in plants occupying different
Habitats, Identify these habitats. (2mks)
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(b) What is the function of pneumatophores? (1mk)
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15. Name two excretory products produced by both plants and animals. (2mks)
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16. What is the meaning of the following terms as they apply to cells
(i) Eukaryotes. (1mk)
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(ii) Prokaryotes. (1mk)
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17. What is the effect of anti-diuretic hormone (ADH) in the human body. (2mks)
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18. State two classes of the phylum chordata where all members are endothermic. (2mks)
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19. State two ways in which parasitic worm of the genus schistosoma gains entry into the
body of human beings. (2mks)
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20. (a) Name the stage in mitosis where chromatids collect together at the two opposite
ends of the spindle fibres. (1mk)
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(b) State two roles of the placenta in humans. (2mks)
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21. Describe the censor mechanism of seed dispersal. (2mks)
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22. The diagram below shows the internal structure of a bean seed
A B C
(a) Name the parts labeled A and B. (2mks)
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(b) What is the role of the structure labeled C? (1mk)
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23. (a) Define the following term
Incomplete metamorphosis. (1mk)
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(b) State one function of each of the following hormones (2mks)
(i) Juvenile hormone.
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(ii) Ecdysone.
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24. State the category of variation into which the following traits fall (2mks)
(i) Blood group.
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(ii) Skin pigmentation.
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25. Differentiate between heterozygosity and homozygosity. (2mks)
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26. Explain “struggle for existence” and “survival of the fittest” as they apply to natural
Selection. (4mks)
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27. State three differences between transmission through the endocrine system and nervous
System. (3mks)
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28. (a) (i) Which eye defect is corrected by bifocal lens. (1mk)
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(ii) Name one cause of the eye defect. (1mk)
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29. State three reasons why plants need support. (3mks)
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30.
(a) Identify the type of muscle shown above (1mk)
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(b) Name two parts in the human body where the type of muscle named in (a) above
is found (2mks)
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31. (a) Name two components of the endoskeleton (2mks)
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(b) The exoskeleton limits continuous growth. Explain (1mk)
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32. What is the function of a swim bladder in fish? (2mks)
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Biology Paper 1 Theory Question Paper

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