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UPSC Prelims 2021 Paper-1 📅 10 Oct, 2021

Which one of the following is a filter feeder?

A
Catfish
B
Octopus
C
Oyster
D
Pelican
Result Summary
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UPSC Prelims
2021 • 10 Oct, 2021 • Paper-1
Which one of the following is a filter feeder?
Correct Answer
Oyster
Feeding Mechanism of Oysters: Oysters are bivalve mollusks that obtain their nourishment by pumping large volumes of water over their gills, trapping and consum......
Ref/Book : UPSC Prelims 2021
Ref. Subject Environment
Chapter -
Ref. Topic Ecology
Pg. No -
💡 Analysis & Explanation
Feeding Mechanism of Oysters ▼
Oysters are bivalve mollusks that obtain their nourishment by pumping large volumes of water over their gills, trapping and consuming suspended plankton and organic particles. This strictly classifies them as filter feeders.
Contrasting Other Species ▼
Catfish generally act as scavengers or bottom-feeding predators. Octopuses are highly active and intelligent predators that hunt crabs and mollusks. Pelicans are piscivorous birds that actively scoop or dive to catch fish.
Conclusion ▼
The oyster is the only organism among the choices that relies on biological filtration for sustenance.
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