Water Ecosystems UPSC Questions

General Issues on Environmental Ecology, Bio-diversity & Climate Change

Water Ecosystems MCQ Questions


1.
Which of the following is an example of a brackish water ecosystem?
A.
Lakes
B.
Shallow seas
C.
Estuaries
D.
Streams
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ANSWER :
C. Estuaries
2.
Neuston organisms are typically found:
A.
At the bottom of aquatic ecosystems
B.
Attached to rooted plants
C.
Floating or just below the air-water interface
D.
Swimming in the middle layers
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ANSWER :
C. Floating or just below the air-water interface
3.
Which zone in an aquatic ecosystem is characterized by the absence of photosynthesis?
A.
Photic zone
B.
Aphotic zone
C.
Littoral zone
D.
Pelagic zone
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ANSWER :
B. Aphotic zone
4.
Which one of the following is used in preparing a natural mosquito repellent?

UPSC - 2021

A.
Congress grass
B.
Elephant grass
C.
Lemongrass
D.
Nut grass
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ANSWER :
C. Lemongrass
5.
What is the term for fish deaths due to oxygen depletion under ice during winter?
A.
Eutrophication
B.
Thermal shock
C.
Winterkill
D.
Profundal death
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ANSWER :
C. Winterkill
6.
Which type of lake is nutrient-rich and usually shallower?
A.
Oligotrophic
B.
Mesotrophic
C.
Eutrophic
D.
Hypolimnetic
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ANSWER :
C. Eutrophic