(a) List the principal sense organs in mammals and their functions.

(b) (i) Describe the eye defect in which only distant objects are seen clearly.
(ii) How can it be corrected? Illustrate your answer with labelled diagrams.

(c) Make a large diagram of the vertical section through the mammalian skin.
 

 (a) Describe briefly the female reproductive system of a named mammal. (A diagram is essential).

(b) List three differences between reproduction in mammals and in amphibians.

(c) Describe the structure and function of the male reproductive organ of a flowering plant. 
 

(a) Mention six ways by which the government is contributing towards self-sufficiency in food production

(b) List five methods Of conserving soil fertility.

(c) Explain how three named agricultural practices can destroy the balance of an ecosystem. 
 

 (a) Explain the following terms: (i) voluntary action. (ii) involuntary action.

(b) State three functions each of: (I) insulin; (ii) auxins.

(c) Describe an experiment to show that plant roots respond positively to gravity. 

(a)(i) Explain briefly the cell theory.
(ii) Name two scientists who contributed to the development of the cell theory.

(b) Make a large labelled diagram of a typical plant cell.

(c) List three ways in which a typical plant cell differs from a typical animal cell.

(d) State one difference each between Hydra and the mammals with respect to:
(i) level of organisation; (ii) symmetry; (iii) number of body layers.