UPSC Prelims 2021 – Question 62

Here is Question No. 63 a part of our series on UPSC Prelims 2021.

Q62. 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

Answer: (b)

• Option 1 is incorrect: Copepods are a group of small crustaceans found in nearly every freshwater and saltwater habitat. Copepods are major secondary producers in the World Ocean
• Option 2 is correct: Cyanobacteria, also called blue-green algae, are microscopic organisms found naturally in all types of water. These organisms are primary producers who use sunlight to make their own food.
• Option 3 is correct: Diatoms are photosynthesizing algae. Diatoms are one of the major primary producers in the ocean

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