First slide

Classification of Animals

Question

Which of the following is incorrect regarding Chondrichthyes?

Easy

A

Notochord is persistent throughout life.
B

Teeth are modified placoid scales
C

Air bladder is absent
D

Gill slits are covered by an operculum

Solution

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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