Operculum is absent in

Labeo

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Pristis

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Exocoetus

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Betta

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Solution

The correct option is B Pristis
Operculum (gill cover) is present in bony fishes and absent in cartilaginous fishes. Pristis is a cartilaginous fish and it lacks an operculum.
Labeo, Exocoetus and Betta are bony fishes and and possess operculum.

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