Waec Biology 2012 Past Questions and Answers

Question 46:

• WAEC 2012

Which of the following factors exerts a major effect on the distribution of living organisms in the habitat?

A. Salt
B. PH
C. Light
D. Rainfall

Question 47:

• WAEC 2012

The use of water closet and septic tanks is preferred to the use of
bucket and pit latrines because

A. It is cost effective
B. Contaminated faeces are completely kept away from flies
C. The water for flushing contains chlorine which kills the germs
D. It prevents flies from breeding

Question 48:

• WAEC 2012

The detection of vibro cholera in public drinking water is a sign of

A. Clean water
B. Outbreak of disease
C. Water pollution.
D. Decayed organisms in the water

Question 49:

• WAEC 2012

Which of the following factors would be least likely to act as a density dependent limiting factor in a population of
mice?

A. Buildup of waste products
B. Predation
C. Parasitism
D. Unfavourable climate

Question 50:

• WAEC 2012

The primary cause of species endangerment is

A. Disappearing habitats
B. Increase in temperatures
C. Acid rain
D. Exposure to hazardous wastes