Biology Past Questions and Answers

(a) In a tabular form distinguish between tropic movement and nastic movement
(b) Explain how light brings about tropic movement in the stem and root of a flowering plant.
(c) What would be observed when a growing seedling is placed horizontally?
(d) State five functions of the pituitary gland
(e) State two difference between growth in plants and growth in animals.

(a) What is a balanced diet?
(b) Name the classes of food stating the importance of any two to the human diet.
(c) In a tabular form, state the source, substrate and end products of the following enzymes: (i) ptyalin: (ii) pepsin; (iii) lipase.

(a) Define the following terms:
(i) gene
(ii) gene mutation.
(b) Name two structures each of plants and animals where the following processes take place:
(i) mitosis
(ii) meiosis.
(c) State four advantages a farmer may hope to derive in cross breeding two different breeds of cows.
(d) State three applications of the knowledge of genetics in medicine.

(a) (i) What is pollution?
(ii) State four pollutants of water
(b) Describe the effects of each of the pollutants named on aquatic organisms.

(a) (i) List five birth control methods.
(ii) State five reasons why family planning is important to a nation.
(b) Make a drawing 8 to 10 cm long of the reproductive system of a human female and label fully.