Biology Practice Test – Nutrient Cycling In Nature (Questions with Answers and Explanations)

In spite of the removal of carbondioxide from the atmosphere, its amount remains more or less constant because _______ (JAMB 1995)

A. it is produced by green plants during photosynthesis
B. it is produced during respiration by animals
C. it is absorbed in ocean water
D. green plants release it during the day

In a community, bacteria and fungi are referred to as ______ (JAMB 1986)

A. producers
B. decomposers
C. scavengers
D. consumers.

The part of the earth that sustains life is known as _______ (NECO 2017)

A. atmosphere.
B. biosphere
C. hydrosphere.
D. lithosphere.

The bacterium in a mutualistic association with legumes converts ______ (WASSCE 2010)

A. nitrates to ammonia.
B. ammonium compounds to nitrates.
C. nitrogen gas to ammonia.
D. nitrites to nitrates.

Atmospheric nitrogen is directly replenished in nature through ______ (JAMB 1985)

A. the activities of denitrifying bacteria
B. the breakdown of ammonium salts in the soil
C. the activities of nitrifying bacteria
D. egestion, death and decay.