Ecosystem, Pollution and Biodiversity CDS Questions

CDS Environmental Geography

Ecosystem, Pollution and Biodiversity MCQ Questions


13.
Which one of the following statements about decomposers is correct?
A.
They directly use solar energy
B.
They convert organic matter into inorganic substances
C.
They produce their own food
D.
They occupy only the first trophic level
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ANSWER :
B. They convert organic matter into inorganic substances
14.
Earthworms, dung beetles and millipedes that feed on dead organic matter are best classified as:
A.
Producers
B.
Detritivores
C.
Carnivores
D.
Top predators
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ANSWER :
B. Detritivores
15.
Without decomposers, an ecosystem would:
A.
Have more biodiversity
B.
Run out of available nutrients for producers
C.
Show faster energy flow
D.
Become more stable
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ANSWER :
B. Run out of available nutrients for producers
16.
Which one of the following is NOT a function of decomposers?
A.
Releasing nutrients from dead organic matter
B.
Producing organic compounds from inorganic ones
C.
Breaking down complex molecules into simpler ones
D.
Recycling chemical elements in the ecosystem
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ANSWER :
B. Producing organic compounds from inorganic ones
17.
Biotic components of an ecosystem include:
A.
Soil, air and water
B.
Sunlight and temperature
C.
Producers, consumers and decomposers
D.
Minerals and gases
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ANSWER :
C. Producers, consumers and decomposers
18.
Which of the following is an abiotic component of the ecosystem?
A.
Bacteria
B.
Phytoplankton
C.
Temperature
D.
Earthworm
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ANSWER :
C. Temperature