Waec Biology Past Questions and Answers

Question 1501:

• 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 1502:

• 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 1503:

• 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

Question 1504:

• WAEC 2013

Rhizobium which lives in the root nodules of leguminous plants is an example of the association known as

A. Commensalism
B. Epiphytism
C. Mutualism
D. Saprophytism

Question 1505:

• WAEC 2013

Ascaris lumbricoides is a parasitic

A. Flat worm
B. Round worm
C. Arthropod
D. Elastic worm