(a) (i) List two diseases each of plants and animals caused by bacteria.
(ii) State three ways in which bacteria are useful.

(b) State three methods by which mosquitoes can be controlled and state the reason for each method

(c) Describe an experiment to demostrate the presence of bacteria under the finger nails

(a) Describe the process of inhalation in man .

(b) Describe briefly the process of gaseous exchange in the shoo: system of flowering plants.

(c) Describe an experiment to demonstrate the effect of distilled water on mammalian red blood cell.
 

(a) Give a brief description of the characteristics of the Northern Guinea Savanna.

(b) Describe how you can estimate the density of a plant species using a quadrat.
 

(a) List four characters which can be transmitted from parent to offspring in man.

(b) State two differences between mitosis and meiosis.

(c) Explain briefly the importance of meiosis and fertilization in the reproduction of organisms.

(d) In a monohybrid cross between a pure breeding plant that produces blue flowers and a pure breeding plant that produces white flowers, the F1 generation produced only blue flowers. By means of labelled cross diagrams, state the type of flowers you would expect if the Fl generation is (i) self-pollinated; (ii) cross-pollinated with a pure breeding plant that produces white flowers. Give reasons for your answers in (d) (i) and (ii). 
 

(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.