Question 66:

• JAMB 1978

Nitrifying bacteria keep the soil fertile by

A. Converting nitrate to nitrogen
B. Converting ammonium salt to nitrate
C. Converting atmospheric nitrogen to plant nitrogen
D. Converting nitrate to nitrous oxide
E. Converting atmospheric nitrogen to nitrates

Question 67:

• JAMB 1978

In the life history of schistosoma (Bilharzia), one of the following is intermediate host

A. Man
B. Snail
C. Mosquito larva
D. Crayfish
E. Fish

Question 68:

• JAMB 1978

In which of the following groups of organisms do all the members have asexual method of reproduction?

A. A geen filament algae, a flowering plant and a bird
B. A toad (or frog) , ameoba and mucor ( penicillium)
C. A flowering plant, tape worm (or ascaris) and a green filamentous algae
D. Mucor (or penicillium), a bird and a toad (or frog)
E. Ameoba, mucor (or penicillium ) and a green filamentous algae

Question 69:

• JAMB 1978

The hormone which tones up the muscles of a person in time of danger is from the

A. Thyroid gland
B. Pancreas
C. Adrenal gland
D. Liver
E. Spleen

Question 70:

• JAMB 1978

The study of organism and the environment of an abandoned farmland is the ecology of?

A. A community
B. A population
C. A specie
D. A habitat
E. An ecosystem