NAME____________________________________ADM________SCHOOL_________________________
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FORM 4 BIOLOGY
TERM ONE 2025
Answer all the questions
1. a) What is the formula of calculating linear magnification of a specimen when using a hand lens?
(1mk)
b) Give a reason why staining is necessary when preparing specimens for observation under the
microscope (1mk)
2. State two functions of Golgi apparatus. (2mks)
3. State the importance of the following processes that take place in the nephrons of a human kidney
(1mk)
4. a)Name a disease of the liver whose symptom is jaundice (1mk)
b)State the causative agent of:
i)Cholera (1mk)
ii)Amoebic dysentery (1mk)
5. The diagram below shows a section through a plant organ
a)Name the class of the plant which the section was obtained (1mk)
b)Give a reason for your answer in (a) above (1mk)
c)State the functions of the part labeled F (1mk)
6. Describe what happens during the light stage of photosynthesis (2mks)
7. Name a support tissue in plants that is not thickened with lignin (1mk)
8. a) In which part of the cell do the following stages of respiration take place. (2mks)
i) Glycolysis
ii) Kreb’s Cycle
b) In which of the two stages above is most energy produced? (1mk)
9. Explain why drug addicts are prone to HIV infection. (2mks)
10. a) i]A man’s urine gave positive reaction with Benedict’s solution. Name the disease he was suffering
from. (1mk)
ii] State two ways in which the symptoms of the condition in (a) above can be controlled. (2mks)
b) Name the hormones involved in regulating glucose level in blood. (2mks)
11. a)Name two structures for gaseous exchange in aquatic plants. (2mks)
b)What is the effect of contraction of the diaphragm muscles during breathing in mammals? (3mks)
12. An experiment was set up in the experiment as shown below.
a. The set up was left for 30 minutes. State the
expected results. (1mk)
b. Account for your answer in (a) above (2mks)
13. State two structural modifications of nephrons found in desert mammals (2mks)
14. a. State two characteristics of Monera that are not found in other kingdoms (2mks)
b. Name the class to which a termite belongs (1mk)
15. a. Distinguish between population and community (2mks)
b. Name the method that can be used to estimate the population size of the following organisms
i] Fish in a pond (1mk)
ii] Black jack in a garden (1mk)
16. Explain how an increase in temperature affects the rate of active transport. (2 marks)
17. Give the synthesis role of smooth endoplasmic reticulum. (1 mark)
18. State two functions of bile juice in the digestion of food. (2 marks)
19. Name the features that increase the surface area of small intestines (2 marks)
20. Explain what happens when there is oxygen debt in human muscles (2 marks)
21. State two ways in which the root hairs are adapted to their function (2 marks)
22. Name two factors that affect transpiration and absorption at any given time (2 marks)
23. State two functions of blood in a human body. (2 marks)
24. State two differences between open and closed circulatory systems (2 marks)
25. State two ways in which the leaf is suited to gaseous exchange (2 marks)
26. State four ways in which respiratory surfaces are suited to their function. (4 marks)
27. What are the three end products of anaerobic respiration in plants (3 marks)
28. What is oxygen debt? (1 mark)
29. Explain what happens to excess amino- acids in the liver of humans (3 mark)
30. a] What is homeostasis? (2 marks)
b] Name three processes in the human body in which homeostasis is involved (3marks)
31. Explain the term binomial nomenclature (2 marks)
32. State the importance of classification. (3 marks)
33. State two external features found in the class Mammalia only. (2 marks)
