Biology O-Level Assessment

Large labelled diagrams should be given where they make the answer clearer.

1. Draw labelled diagrams, one in each case, to show the structure of (a) the shoulder joint, and (b) the elbow joint, of a mammal. Explain how the muscles act on the bones to bring about movement at the elbow.

2. (a) What part does the skin play in regulating the temperature of a mammal?
    (b) Give a brief account of the functions of any one named hormone and any one named enzyme in a mammal,

3. Give an account of the life-history and economic importance of either the mosquito or the house fly.

4. What are the distinguishing characteristic features (a) in summer, (b) in winter, of any two named deciduous trees?
Describe how the following changes are brought about: (i) secondary thickening, (ii) the formation of bark.

5. Give an account of the pollination of one, named, wind- pollinated flower.
What are

(a) the methods of dispersal of the seeds of this flower, and

(b) the conditions the seeds must have before they will germinate?

6. Describe experiments, one in each case, that you would do to find out whether a green plant

(a) manufactures starch,

(b) evolves oxygen, in sunlight.
State three differences between photosynthesis and respiration.

7. Describe the constituents and the physical properties of a sandy soil and a clay soil.
What is the value in agriculture of

(a) manuring the soil,

(b) the rotation of crops?

8. What is meant by a habitat? Name five animals (excluding Amoeba, Paramecium, Hydra and frog) and five plants (ex- cluding Spirogyra and Mucor) which live together in any one named natural habitat. Explain any relation they have to their environment and to each other.

Question

1. Name two different organs found in the thorax of a mammal,

2. State three differences between a molar tooth of a herbivore and a molar tooth of a carnivore.

3. Write down two functions of the liver of a mammal.

4. (a) List three differences between arteries and veins.

    (b) Name the blood vessels that carry the blood to the kidneys.?

5. Give three differences in structure between a red blood corpuscle and a white blood corpuscle.

6. Write down an equation to represent respiration.

7. (a) State one function of the iris of the eye.

    (b) Name the type of lens used to correct short sight.

8. Where does the placenta develop in a mammal?

Write down two functions of the placenta.

9. Write down three ways in which a primary wing feather is adapted for flight.

10. State one function of the contractile vacuole in Amoeba (or Paramecium).

11. Write down three ways in which fishes are adapted to life in water.

12. Name one animal on which Hydra feeds.

13. Define osmosis.

14. Name two metallic elements required by green plants for chlorophyll production.

15. Name three conditions that favour a high rate of transpiration.

16. Name the growth response made by plant organs, when illuminated from one side.

17. Where would you expect to find Spirogyra in nature?

18. Name a saprophyte. Where would you expect to find it growing?

19. Name two chemical compounds which are used to supply crops with nitrogen.

20. Name the reagents you would use to test for (a) a reducing sugar, (b) a protein.

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