Name………………………………………................... Index Number…….......……………………..
Date............................................... Candidates signature…………………....
231/1
BIOLOGY
PAPER 1
(THEORY)
FORM 3
2 HOURS
Instructions to the Candidate
(a) Write your name, index number, sign and date of the examination.
(b) Answer ALL questions in the spaces provided.
(c) Non-programmable electronic calculators may be used.
(d) ALL working must be clearly shown where necessary.
FOR EXAMINER’S USE ONLY
QUESTION MAXIMUM SCORE CANDIDATE’S
SCORE
1 – 31 80
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Answer all questions.
1. Define the following terms. (2 marks)
(a) Parasitology
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(b) Entomology
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2. Explain what happens during the dark stage of photosynthesis. (3 marks)
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3. The diagram below shows a species of a plant. Study it carefully and answer the questions to
follow.
(a) State the class to which the above specimen belongs (1mark)
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(b)Reason (1mark)
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4. What is the significance of the following?
(a) Cartilage in the trachea (1mark)
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(b) Mucus on the inner surface of the trachea. (1mark)
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(c) Moisture on the surface of the alveoli (1 mark)
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5. State three properties of the cell membrane. (3 marks)
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6. What is meant by the following terms?
(a) Protandry (1mark)
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(b) Self-sterility (1mark)
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7. State the importance of each of the following excretory products in plants.
(a) Rubber (1 mark)
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(b) Papain (1 mark)
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8. The set up below was prepared by a form one student study it and answer the questions that
follow.
(a) After a few hours it was found that reducing sugars were present in the distilled water. State
what happened.
(i) Inside the tube shaped membrane (1mark)
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(ii) At the walls of the membrane (1mark)
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(b) The apparatus above is a poor representation of the ileum. Give two reasons to support this
statement. (2marks)
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9. Distinguish between natural and acquired immunity. (2marks)
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10. (a) Define the following terms (2 marks)
(i) Carrying capacity
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(ii) Synecology
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(b) Distinguish between population and community (2 marks)
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11. (a) State the class to which organism shown in the diagram below belongs. (1mark)
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(b) Give three characteristics used to place the organism into the class named in (a) above.
(3marks)
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12. The diagram below was set up to study a certain physiological process. Glucose solution was
boiled and cooled before adding yeast.
(a) Identify the process being investigated. (1mark)
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(b) What observation was made after 8 hours? (1mark)
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(c) State and explain the expected results if the yeast suspension was boiled and then put in
glucose solution? (2 marks)
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13. State two ways in which the root hairs are adapted to their functions. (2marks)
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14. Define the following terms. (2marks)
(a) Excretion
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(b) Secretion
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15. Study the figure below and answer the questions that follow.
(a) Name the parts labeled B, C and D (3marks)
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(b) State the function of part labeled A. (1mark)
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16. What is meant by the term binomial nomenclature (1mark)
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17. State two characteristics of aerenchyma tissue. (2marks)
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18. Explain what happens when there is oxygen debt in human muscles. (2marks)
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19. State the adaptations of the following tissues for support in plants. (2marks)
(a) Collenchyma
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(b) Sclerenchyma
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20. Study the fruits below and classify them, giving reasons.
Seeds
Pericarp
(a) Type of fruit (1mark)
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Reason (1mark)
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Remains of the style
Attachment to cob
(b) Type of fruit (1mark)
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Reason (1mark)
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21. During which phase of meiosis does crossing occurs. (1mark)
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22. Give the function of the following parts of a microscope.
(a) Condenser (1mark)
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(b) State the importance of the following when preparing temporary slides. (2marks)
(i) Making a thin plant section
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(ii) Adding a drop of water
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23. Explain the importance of respiratory surface being
(a) Thin walled (1 mark)
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(b) Moist (1 mark)
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24. Explain how hair in human beings keeps the body warm (2marks)
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25. The equation below represents a process that occurs in the plants.
C6H12O6 B + C2H5OH+ Energy
(a) Name the process. (1mark)
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(b) Name product B (1mark)
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(c) State the economic importance of this process. (2marks)
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26. Name the spore-producing structures in
(a) Pteridophyta. (1mark)
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(b) Bryophta (1mark)
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27. Give two advantages of being a homoiotherm. (2marks)
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28. State how xylem vessel is adapted to its function. (3marks)
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29. State functional differences between arteries and veins. (2marks)
Arteries Veins
30. Name the hard outer covering of the members of the phylumArthropoda. (1mark)
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31. State three roles played by the structure named in (a) above. (3 marks)
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