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Q.

Which of the following organisms swim constantly to avoid sinking?

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a

Exocoetus

b

Pterophyllum

c

Hippocampus

d

Carcharodon

answer is D.

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Detailed Solution

Air bladder regulates buoyancy. It is absent in the cartilaginous fishes (Chondricthyes). Thus, cartilaginous fishes (e.g., Carcharodon – great white shark) have to swim constantly to avoid sinking.

Hippocampus, Pterophyllum and Exocoetus possess air bladder.

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