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UPSC Prelims GS - 2021
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Question 22
MEDIUM
Correct: +2
Incorrect: -2
Consider the following kinds of organisms:
1. Copepods
2. Cyanobacteria
3. Diatoms
4. Foraminifera
Which of the above are primary producers in the food chains of oceans?
a
Congress grass
b
2 and 3
c
3 and 4
d
1 and 4
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