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Q.

Which of the following fishes has to swim constantly to avoid sinking?

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a

Exocoetus

b

Pristis

c

Clarias

d

Rohu

answer is B.

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Detailed Solution

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Pristis belong to the class Chondrichthyes which do not have air bladder. They have to swim constantly to avoid sinking.

Rohu , Exocoetus and Clarias are bony fishes which have the air bladder. It helps in maintaining buoyancy.

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