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Q.

Identify the fish that has to swim constantly to avoid sinking.

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a

Rohu

b

Pristis

c

Exocoetus

d

Clarias

answer is B.

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Detailed Solution

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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