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Q.

Which of the following are true for class Osteichthyes?

a. Claspers facilitate internal fertilisation.

b. An operculum covers gill-slits on each side.

c. An air bladder regulates buoyancy.

d. Caudal fin is heterocercal.

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An Intiative by Sri Chaitanya

a

(a), (b) and (c)

b

(a) and (b)

c

(c) and (d)

d

(b) and (c)

answer is A.

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Detailed Solution

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Operculum and air bladder are the characteristics of bony fishes (Osteicthyes).

Claspers and heterocercal caudal fins are found in Chondrichthyes.

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