Waec Biology Past Questions and Answers

Question 286:

• WAEC 1993

Which of the following is not an adaptation of plants or animals to desert environment?

A. Well developed tap root system
B. Small leaves with thick Epidermis
C. Stems with spike-like leaves
D. Metabolic waste in the form of uric acid in some animals
E. Broad leaves for storage

Question 287:

• WAEC 1993

A climax community is characterised by

A. A stable composition of plant and animal species
B. Rapid changes in the composition of species
C. Constant changes in appearance of the habitat
D. Different species occurring at different times
E. Gradual change in animal population

Question 288:

• WAEC 1993

Which of the following is not a characteristic of overcrowding in plant and animal community?

A. Population outstripping available space
B. Population exceeding available food
C. Competition within the population
D. Increase in primary production
E. Population increasing at the same rate as the birth rate

Question 289:

• WAEC 1993

The use of predators or parasites to control pests in the farm is known as

A. Predator control
B. Chemical control
C. Biological control
D. Animal control
E. Parasitic control

Question 290:

• WAEC 1993

Which of the following substances cannot control the growth of harmful micro organisms?

A. Antibiotics
B. Hypertonic salt solution
C. Disinfectants
D. Isotonic sugar solution
E. Antiseptics.