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
😑 View Answer Rough Work Error
ANSWER :
C. Estuaries
2.
The surface of a lake in frozen in severe winter,but the water at its button is still liquid.What is the reason ?
UPSC - 2011
A.
Ice is a bad conductor of heat
B.
Since the surface of the lake is at the same temperature as the air no heat is lost.
C.
The density of water is maximum at 4°C. 
D.
None of the statements a b and c given is correct.
😑 View Answer Rough Work Error
ANSWER :
C. The density of water is maximum at 4°C. 
3.
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
😑 View Answer Rough Work Error
ANSWER :
C. Floating or just below the air-water interface
4.
There is a concern over the increase in harmful algal blooms in the seawaters of India. What could be the causative factors for this phenomenon?
1. Discharge of nutrients from the estuaries.
2. Run-off from the land during the monsoon.
3. Upwelling in the seas.
Select the correct answer from the codes given below:
UPSC - 2011
A.
1 only
B.
1 and 2 only
C.
2 and 3 only
D.
1,2, and 3
😑 View Answer Rough Work Error
ANSWER :
D. 1,2, and 3
5.
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
😑 View Answer Rough Work Error
ANSWER :
B. Aphotic zone
6.
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
😑 View Answer Rough Work Error
ANSWER :
C. Lemongrass