Civil Services Prep

Prelims 2014 · Environment · Question 60

Which one of the following is the correct sequence of a food chain?

  1. Diatoms-Crustaceans-Herrings
  2. Crustaceans-Diatoms-Herrings
  3. Diatoms-Herrings-Crustaceans
  4. Crustaceans-Herrings-Diatoms

Answer

Diatoms-Crustaceans-Herrings

  • (a) Diatoms-Crustaceans-Herrings: Diatoms are phytoplankton/producers. Small crustaceans feed on them, and herrings feed on zooplankton/crustaceans. Correct.
  • (b) Crustaceans-Diatoms-Herrings: Consumers cannot come before producers in a food chain. Crustaceans feed on diatoms, not vice versa. Incorrect.
  • (c) Diatoms-Herrings-Crustaceans: Herrings do not directly precede crustaceans in this chain; crustaceans are the intermediate consumers feeding on diatoms. Incorrect.
  • (d) Crustaceans-Herrings-Diatoms: Producers must be at the base of the food chain, so diatoms cannot come last. Incorrect.
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