Civil Services Prep

Prelims 2021 · Environment · Question 26

Which one of the following is a filter feeder?

  1. Catfish
  2. Octopus
  3. Oyster
  4. Pelican

Answer

Oyster

  • (a) Catfish: Catfish are generally bottom-feeding fish that eat insects, small fish, and organic matter; they are not typical filter feeders. Verdict: Incorrect.
  • (b) Octopus: Octopus is a predatory mollusc that hunts crabs, fish, and shellfish using its arms and beak. Verdict: Incorrect.
  • (c) Oyster: Oysters are classic filter feeders; they draw in water and trap plankton and suspended particles for food. Verdict: Correct.
  • (d) Pelican: Pelicans catch fish with their pouch; they are not filter feeders in the biological sense. Verdict: Incorrect.
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