Waec Biology Past Questions and Answers

Question 1381:

• WAEC 2011

Which of the following methods does not make water fit for drinking?

A. Addition of chlorine
B. Boiling
C. Distillation
D. Addition of alum

Question 1382:

• WAEC 2011

Vaccination results in

A. Aiding red blood cells to carry more oxygen
B. Production of antibodies which destroy toxins of germs
C. Arresting excessive bleeding
D. Production of white blood cells which engulf and digest bacteria.

Question 1383:

• WAEC 2011

Leguminous crops are incorporated into crop rotation in order to

A. Improve aeration of the soil.
B. Promote nitrogen fixation
C. Increase the rate of soil formation
D. Improve upon the water holding capacity of the soil

Question 1384:

• WAEC 2011

Which of the following practices improves crop yield in a clayey soil? Addition of

A. More water and humus
B. Lime and humus
C. Fertilizers
D. Weedicides and fertilizers

Question 1385:

• WAEC 2011

Which of the following activities promotes forest conservation?

A. Lumbering
B. Use of firewood for cooking
C. Afforestation
D. Production of paper