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Q.

In which of the following four pairs of gills covered by operculum on each side is seen?

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a

Myxine

b

Betta

c

Pristis

d

Trygon

answer is B.

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Detailed Solution

Betta is a bony fish. In Osteichthyes four pairs of gills are present on each side and they are covered with operculum.Myxine is a cyclostome.Pristis and Trygon are the members of Chondrichthyes. In Cyclostomata and Chondrichthyes, operculum doesn't cover the gills.
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