Waec Biology Past Questions and Answers

Question 271:

• WAEC 1993

Which of the following mineral salts is a trace element?

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

Question 272:

• 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 273:

• 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

Question 274:

• WAEC 1993

What is the function of the part labelled ll?

A. Attraction of insects
B. Secretion of nectar
C. Protection of the stigma
D. Formation of fruit wall
E. Attachment of flower to the shoot.

Question 275:

• WAEC 1993

The function of the part labelled l is to

A. Receive pollen grains
B. Produce nectar
C. Store the pollen grains
D. Store the ovules
E. Produce the male gametes