Waec Biology Past Questions and Answers

Question 181:

• WAEC 1991

Predators are beneficial in pest control because they

A. Are natural enemies of small mammals
B. Devour farm animals
C. Feed on pests of crops
D. Prey on game animal
E. Compete for food with the pests

Question 182:

• WAEC 1991

I.Plasmodium II. Vibro Choleroe III. Gonococcus sp IV. Poliomyelitis virus V. Syphilis bacteria
which of the following organism are transmitted by houseflies?

A. I and II only
B. II and V only
C. III and IV only
D. II and IV only
E. III and V only

Question 183:

• WAEC 1991

The practice of warming soup regularly as it concerns food preservation is essentially to

A. Retain the taste
B. Help to break down cellulose
C. Remove excess water
D. Kill the bacteria in it
E. Raise the temperature

Question 184:

• WAEC 1991

Agglutination occurs in blood transfusion when the

A. Donor and the recipient belong to the same blood group
B. Same antibodies from donor and recipient fuse together
C. Donor and the recipient belong to different race
D. Recipient is not a universal recipient
E. Antigens and anitbody in the donor and the recipient react

Question 185:

• WAEC 1991

Which of the following is not a way of conserving natural resources?

A. Controlling farming practice
B. Establishing forest reserve
C. Establishing of parks and gardens
D. Encouraging poaching in game reserve
E. Protecting endangered species