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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

Pristis

b

Trygon

c

Myxine

d

Betta

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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