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.