Biology Paper 1 Form 3 Question Paper

Exam Name: Biology Paper 1 Form 3 

Course: Biology

Category: Form 3 question papers

Exam Year:2008

Biology Form 3

Answer all questions in the spaces provided

1. Explain why sunken stomata lowers the rate of transpiration (2mks)

2. Name the two nuclei found in mature pollen grains (2mks)

3 (a) What is a food web (2mks)

b. State three methods that you could use to approximate a population of grass in a field (2mks)

4. Give two differences between transpiration and guttation (2mks)

5. State the features of the placenta that enables it to perform its functions (3mks)

6. State two roles of each of the following hormones in human females

a. Follicle stimulating hormone (2mks)

b. Oxytocin (2mks)

7. Account for the differences in the thickness of cell walls of a guard cell (2mks)

8. Briefly explain why active transport rate increases when oxygen concetration is increased in water plants (2mks)

9. Why is the skin of amphibians like frogs highly folded (2mks)

10. Distinguish between diabetes insipidus and diabetes mellitus (2mks)

11. When raw sewage is disposed in a river, the population of mobile aquatic animals reduces down the river. Briefly explain the effects of raw sewage on the population of the aquatic animals in the river (2mks)

12. When a mammal feeds on a heavy protein meal, the liver starts being overworked immediately the soluble products of digestion are absorbed.

a. Name the process that takes place in the liver (1mk)

b. Explain the process in (a) above and name the products formed (2mks)

13. Identify two main features that adapt the stomach of man to its functions (2mks)

14. Name the organelles that would be present in large numbers in the following tissues:

a. Actively photosynthetic tissue (1mk)

b. A secretory tissue (1mk)

15. An athlete who was preparing for a marathon race decided to prepare on a high altitude zone. He chose to climb up a mountain where he stayed practising for a month. Name the changes that occurred in the circulatory and gaseous exchange systems of the athlete (3mks)

16. The first HIV/AIDS patient in Western Kenya was discovered in Kakamega general hospital in 1982. Since then, the number of victims has risen to thousands. Name the ways in which HIV/AIDS has been spread (3mks)

17. State the functions of human lungs (2mks)

18. Give three events that follow fertilization in a flower (3mks)

19. State three reasons to explain importance of seed dormancy in plants (3mks)

20. Name three likely dangers that can arise from prolonged use of skin beauty cosmetics (3mks)

21. Define the following terms as used in microscopy

a. Resolution power (1mks)

b. Magnification power (1mk)

22. Explain why it is important that menstruation stops during pregnancy (2mks)

23. Give two characteristics of phylum arthropoda (2mks)

24. State two adaptations of spiracles to their functions (2mks)

25. Name two functions of glycerol to human body cells (2mks)

26. A student measured the diameter of a mitochondrion on a photomicrograph whose magnification was x50000 to be 1mm. What was the actual diameter of the mitochondrion in micrometer (2mks)

27. Give two reasons as to why the pH keeps on changing along the alimentary canal (2mks)

28. Give two advantages of a larger percentage of carbon (iv) oxide being transported in the red blood cells instead of the plasma (2mks)

29. State three differences that may be observed between a normal human male adult and one who is incapable of producing testosterone hormone (3mks)

30. Name three physiological changes that take place in a human skin in order to facilitate heat loss from the body (3mks)

31. Explain the mechanism that leads to the closing of stomata in most plants at night (4mks)

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