Waec Biology Past Questions and Answers

Question 111:

• WAEC 1990

Thunderstorm can be beneficial to plants because it

A. Kills the pest that attacks crops
B. Destroys some of the major crops
C. Adds nitrates to the soil
D. Adds lime to the soil
E. Makes rain water available to plants

Question 112:

• WAEC 1990

Which of the following is a nitrifying bacterium

A. Nitrobacter
B. Rhizobium
C. Azotobacter
D. Clostribium
E. Nitrosomonas

Question 113:

• WAEC 1990

Which of the following reagents is used for the test for starch?

A. Million’s reagent
B. Fehling’s’ solution
C. Sudan III
D. Iodine solution
E. Benedict’s solution

Question 114:

• WAEC 1990

Which of the following is an autotrophic mode of nutrition?

A. Chemosynthesis
B. Saprophytism
C. Parasitism
D. Symbiosis
E. Commensalism

Question 115:

• WAEC 1990

Which of the following is not a way of reducing air pollution?

A. Siting factories and power stations away from residential areas
B. Building tall factory chimneys
C. Passing waste gases through filters and absorbers
D. Using lead-free petrol in cars
E. Recycling tins, cans and bottles