The gills are not covered in while have gills covered by operculum.

Echinoderms

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Osteichthyes

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Chondrichthyes

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Platyhelminthes

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Solution

The correct option is C Chondrichthyes
In cartilaginous fishes, gill slits are separate and without operculum (gill cover). Bony fishes possess gill slits that are covered by an operculum.

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(b)	Claspers on pelvic fins of males	(ii)	Cyclostomes
(c)	4 pairs of gills covered with operculum	(iii)	Chondrichthyes
(d)	Electric organs	(iv)	Osteichthyes

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