Here is Question No. 63 a part of our series on UPSC Prelims 2021.
Q62. Consider the following kinds of organisms :
Copepods
Cyanobacteria
Diatoms
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