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UPSC 2021: Which one of the following is a filter feeder?
(a)Catfish
(b)Octopus
(c)Oyster
(d)Pelican
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Not attemptedCorrect Answer: (c) Oyster
Oysters are bivalve molluscs that pump water across their gills and sieve out suspended microscopic food; they are textbook filter feeders. Catfish and pelicans capture larger prey, while octopuses are active hunters, so they do not use filter feeding. ([britannica.com](https://www.britannica.com/science/feeding-behavior?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2021 Environment & Ecology question?▼
The correct answer is option (c): Oyster. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Ecosystems & Ecology Concepts question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2021, GS Paper 1, as Question 26. It falls under Environment & Ecology > Ecosystems & Ecology Concepts.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Ecosystems & Ecology Concepts?▼
UPSC has asked 48 questions from Ecosystems & Ecology Concepts (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.