BIOLOGY FORM 3
APRIL 2020 HOLIDAY ASSIGNMENT
QUESTIONS
1. a. Discuss the role of living organisms in the nitrogen cycle(10mks)
b. Describe the structural adaptations of the mammalian heart(20mks)
2. a. name the site of gaseous exchange during breathing in mammals(1mk)
b. State three characteristics of the site named in (a) above(3mks)
3. Describe changes that occur in ribcage and diaphragm during inspiration(10mks)
4. a. Briefly describe how stomata opens by photosynthetic theory(10mks)
b. Sugar to starch interconversion(10mks)
5. Distinguish between diabetes mellitus and diabetes insipidus(2mks)
6. Describe how mammalian skin regulate body temperature(20mks)
7. Explain five abiotic factors that affect the ecosystem(20mks)
8. a. What is digestion(1mk)
b. Describe how mammalian small intestine is adapted to its function(15mks)
9. Two fresh potato cylinders of equal length were placed one in distilled water and the other
in concentrated salt solution.
a. Account for the changes in length of the cylinder in
i. Distilled water
ii. Sucrose solution
b. i. What would be the result in terms of length if a boiled potato was used(1mk)
ii. Explain your answer in b(i) above (2mks)
c. State two uses of the physiological process being demonstrated in the experiment(2mks)
10. Distinguish between the following terms
a. Magnification and resolution of a microscope(2mks)
b. Mounting and staining of a specimen(2mks)
APRIL 2020 HOLIDAY ASSIGNMENT
QUESTIONS
1. a. Discuss the role of living organisms in the nitrogen cycle(10mks)
b. Describe the structural adaptations of the mammalian heart(20mks)
2. a. name the site of gaseous exchange during breathing in mammals(1mk)
b. State three characteristics of the site named in (a) above(3mks)
3. Describe changes that occur in ribcage and diaphragm during inspiration(10mks)
4. a. Briefly describe how stomata opens by photosynthetic theory(10mks)
b. Sugar to starch interconversion(10mks)
5. Distinguish between diabetes mellitus and diabetes insipidus(2mks)
6. Describe how mammalian skin regulate body temperature(20mks)
7. Explain five abiotic factors that affect the ecosystem(20mks)
8. a. What is digestion(1mk)
b. Describe how mammalian small intestine is adapted to its function(15mks)
9. Two fresh potato cylinders of equal length were placed one in distilled water and the other
in concentrated salt solution.
a. Account for the changes in length of the cylinder in
i. Distilled water
ii. Sucrose solution
b. i. What would be the result in terms of length if a boiled potato was used(1mk)
ii. Explain your answer in b(i) above (2mks)
c. State two uses of the physiological process being demonstrated in the experiment(2mks)
10. Distinguish between the following terms
a. Magnification and resolution of a microscope(2mks)
b. Mounting and staining of a specimen(2mks)
