Water Ecosystems UPSC Questions

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

Water Ecosystems MCQ Questions


7.
In the context of ecosystem productivity, marine upwelling zones are important as they increase marine productivity by bringing the
1. Decomposer microorganisms to the surface.
2. Nutrients to the surface.
3. Bottom-dwelling organisms to the surface.
Which of the statements given above is/are correct?
UPSC - 2011
A.
1 and 2 only
B.
2 only
C.
2 and 3 only
D.
3 only
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ANSWER :
B. 2 only
8.
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
9.
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
10.
‘R2 Code of Practices' constitutes a tool available for promoting the adoption of

UPSC - 2021

A.
environmentally responsible prac­tices in electronics recycling industry
B.
ecological management of Wetlands of International Importance' under the Ramsar Convention
C.
sustainable practices in the cultivation of agricultural crops in degraded lands
D.
Environmental Impact Assessment' in the exploitation of natural resources
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ANSWER :
A. environmentally responsible prac­tices in electronics recycling industry
11.
Other than poaching, what are the possible reasons for the decline in the population of Ganges River Dolphins?
1. Construction of dams and barrages on rivers
2. Increase in the population of crocodiles in rivers
3. Getting trapped in fishing nets accidentally
4. Use of synthetic fertilizers and other agricultural chemicals in crop-fields in the vicinity of rivers.
Select the correct answer using the code given below.
UPSC - 2014
A.
1 and 2 only
B.
2 and 3 only
C.
1, 3 and 4 only
D.
1, 2, 3 and 4
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ANSWER :
C. 1, 3 and 4 only
12.
Which plant group dominates as producers in wetland ecosystems?
A.
Phytoplankton
B.
Macrophytes
C.
Zooplankton
D.
Seaweeds
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ANSWER :
B. Macrophytes