Waec Biology 2013 Past Questions and Answers

Question 31:

• WAEC 2013

The producers in a food chain in an aquatic environment are

A. Birds
B. Phytoplankton
C. Zooplankton
D. Fishes

Question 32:

• WAEC 2013

The frog is considered a better swimmer than the toad because it

A. Has more pronounced webbed digits
B. Has much longer and stronger hind limbs
C. Lives in water most of the time
D. Is more streamlined than the toad

Question 33:

• WAEC 2013

The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as

A. Nitrifying bacteria
B. Denitrifying bacteria
C. Putrefying bacteria
D. Saprophytic bacteria

Question 34:

• WAEC 2013

A pyramid of numbers is constructed by

A. Comparing living and non-living things
B. Measuring productivity
C. Conducting census
D. Labelling the living organisms

Question 35:

• WAEC 2013

The main reason for immunizing children is to

A. Destroy pathogens in their bodies
B. Increase the production of white blood cells
C. Stimulate the production of antibodies
D. Simulate the production of antigens