Q.

Which of the following is incorrect regarding Chondrichthyes?

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a

Notochord is persistent throughout life.

b

Gill-slits are covered by an operculum.

c

Teeth are modified placoid scales.

d

Air bladder is absent.

answer is D.

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Detailed Solution

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In Chondrichthyes, gill-slits are separate and without operculum. Notochord is persistent throughout life. Teeth are modified placoid scales which are backwardly directed. Air bladder is absent.

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