Waec Biology Past Questions and Answers

Question 306:

• WAEC 1993

Lamarck’s evolution theory could be summarised by the statement that

A. Only the fittest can survive in a challenging environment
B. Species that are unable to adapt become extinct
C. New characteristics do not arise in organisms in time of need
D. The changing environment imposes structural physiological and behavioural changes in organisms
E. In a changing and unstable environment nature rejects the weak

Question 307:

• WAEC 1993

The property of clay soil that prevents it from supporting thick vegetation is its

A. Possession of chemically weathered granite rocks
B. Inability to retain much water
C. Tendency of becoming waterlogged
D. Porosity and low water retention ability
E. High capillary spaces between the soil particles

Question 308:

• WAEC 1993

(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

Question 309:

• WAEC 1993

(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.

Question 310:

• WAEC 1993

(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.