The below characters belong to which class?
(i) Four pairs of gills covered by an operculum on each side.
(ii) Skin is covered with cycloid/ctenoid scales.
(iii) Air bladder is present which regulates buoyancy.
(iv) Mostly oviparous and development is direct.

Osteichthyes

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Chondrichthyes

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Cyclostomata

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All of these

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Solution

The correct option is A Osteichthyes
Osteichthyes is a class of jawed fishes having a bony endoskeleton. They have following characteristics:

They have four pair of gills covered by an operculum on each side

Their skin is covered with cycloid/ctenoid scales

They have air bladder

They are mostly oviparous

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

	Characteristics	Class
1	Sucking and circular mouth, jaws absent, integument without scales, paired appendages	Cyclostomata
2	Body covered with feathers, skin moist and glandular, forelimbs form wings, lungs with air sacs	Aves
3	Mammary gland, the hair on the body, pinnae, two pairs of limbs	Mammalia
4	Mouth ventral, gills without operculum, skin with placoid scales, persistent notochord	Chondrichthyes