Coral Reefs CDS Questions

CDS Physical Geography

Coral Reefs MCQ Questions


1.
Coral reefs are primarily built by which of the following organisms?
A.
Marine plants
B.
Tiny marine animals called polyps
C.
Algae only
D.
Sea sponges
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ANSWER :
B. Tiny marine animals called polyps
2.
The hard skeleton of coral reefs is made up of:
A.
Silica
B.
Calcium carbonate
C.
Magnesium sulphate
D.
Sodium chloride
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ANSWER :
B. Calcium carbonate
3.
Which of the following is NOT an essential condition for coral reef formation?
A.
Warm temperature between 20°C-25°C
B.
Shallow depth with sunlight penetration
C.
Fresh water inflow from rivers
D.
Clear and saline water
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ANSWER :
C. Fresh water inflow from rivers
4.
Coral polyps thrive best at water temperatures of:
A.
10°C to 15°C
B.
15°C to 20°C
C.
20°C to 25°C
D.
30°C to 35°C
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ANSWER :
C. 20°C to 25°C
5.
The optimal depth for coral reef formation is generally:
A.
Below 200 metres
B.
Between 100-200 metres
C.
Less than 50 metres
D.
Between 500-1000 metres
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ANSWER :
C. Less than 50 metres
6.
Which of the following is the largest coral reef in the world?
A.
Belize Barrier Reef
B.
Great Barrier Reef
C.
New Caledonia Barrier Reef
D.
Florida Reef
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ANSWER :
B. Great Barrier Reef