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UPSC Prelims 2021 Paper-1 📅 10 Oct, 2021

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
1 and 2
B
2 and 3
C
3 and 4
D
1 and 4
Result Summary
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UPSC Prelims
2021 • 10 Oct, 2021 • Paper-1
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?
Correct Answer
2 and 3
Photosynthetic Organisms: Cyanobacteria (often termed blue-green algae) and Diatoms are major groups of phytoplankton. They possess chlorophyll and perform phot......
Ref/Book : UPSC Prelims 2021
Ref. Subject Environment
Chapter -
Ref. Topic Ecology
Pg. No -
💡 Analysis & Explanation
Photosynthetic Organisms ▼
Cyanobacteria (often termed blue-green algae) and Diatoms are major groups of phytoplankton. They possess chlorophyll and perform photosynthesis, forming the foundational base of marine food webs as primary producers. Thus, items 2 and 3 are correct.
Consumer Organisms ▼
Copepods are tiny crustaceans that feed on phytoplankton, categorizing them as zooplankton and primary consumers. Foraminifera are primarily heterotrophic protists that capture their food, not producers. Thus, items 1 and 4 are incorrect.
Conclusion ▼
Only Cyanobacteria and Diatoms serve as primary producers.
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