(a) List five classes of food other than carbohydrates.

(b) Explain why glucose is taken by an athlete ready for a race rather than corn meal.

(c) Describe the test for starch.

(a) Name the four levels of organisation in living organisms.
 (ii) Explain two of the levels of organisation named in (a)(i) above
 

(a) Describe the water cycle using an annotated diagram (s) only.

(b) What is the importance of water tc living organisms? 
 

(a) Explain the term osmosis.

(b) Describe an experiment to show that the xylem tissue conducts water from the rot to the shoot.

(c)(i) Explain what happens to a red blood cell when placed in a hypotonic solution
(ii) Mention three conditions that may cause haemolysis 

State the principles involved in the following methods of food preservation:
(a) (i) Salting (ii) Refrigeration (iii) Drying (iv) Smoking (v) Chemicals.

(b) State four problems that may be caused by human overpopulation.

(c) Explain three ways by which the Government may increase food production.