UPSC CSE Prelims
Question 90
Which one of the following is the correct sequence of a food chain?
View correct answer and explanation
Correct answer: A
Correct Option: A
Explanation: Aquatic food chains often begin with photosynthetic diatoms, then small zooplankton crustaceans, then fish such as herrings.
Option-wise Analysis:
A: Correct - Correct: diatoms → crustaceans → herrings follows producer to consumers.
B: Incorrect - Crustaceans feed on diatoms, not vice versa.
C: Incorrect - Herrings ordinarily eat zooplankton; putting them before crustaceans reverses trophic order.
D: Incorrect - Placing diatoms last wrongly makes primary producers the top consumer.