Gills slits on each side covered with operculum is present in

All elasmobranchs

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Some elasmobranchs

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All teleosts

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None of the above

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Solution

The correct option is C All teleosts
An operculum is a bony plate that covers the gills and protects it in bony fishes (teleosts). It plays an important role in breathing mechanism by increasing and decreasing the volume of gills. The presence of operculum is an important adaptation of the class teleosts.

Suggest Corrections

	Column-I		Column-II
(a)	Scales and paired fins absent	(i)	Torpedo
(b)	Claspers on pelvic fins of males	(ii)	Cyclostomes
(c)	4 pairs of gills covered with operculum	(iii)	Chondrichthyes
(d)	Electric organs	(iv)	Osteichthyes