Waec Biology 1993 Past Questions and Answers

Question 21:

• WAEC 1993

This defect can be corrected by the use of

A. Convex lens
B. Concave lens
C. Cylindrical lens
D. Surgical operation
E. Biconcave lens

Question 22:

• WAEC 1993

Which of the following is not a courtship behaviour exhibited of animals?

A. Pairing
B. Display
C. Seasonal migration
D. Hibernation
E. Territorialism.

Question 23:

• WAEC 1993

Which of the following mineral salts is a trace element?

A. Zinc
B. CArbon
C. Hydrogen
D. Potassium
E. Calcium

Question 24:

• WAEC 1993

Which of the following organisms reduces nitrates in the soil to gaseous nitrogen?

A. Euglena
B. Protozoan
C. Denitrifying bacterium
D. Parasitic mould
E. Nitrifying bacterium

Question 25:

• WAEC 1993

The process whereby microorganisms can convert atmospheric nitrogen into nitrogenous compound is
known as

A. Nitrogen cycle
B. Nitrogen fixation
C. Denitrification
D. Putrefaction
E. Decomposition