Waec Biology 2011 Past Questions and Answers

Question 46:

• 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 47:

• 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 48:

• 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 49:

• WAEC 2011

Which of the following activities promotes forest conservation?

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

Question 50:

• WAEC 2011

Which of the following statements is not true about continuous variation? It

A. Is usually controlled by several genes
B. Can be influenced by environmental factors
C. Follows a normal distribution curve
D. Is usually controlled by one or two pair(s) of genes