Which of the following is incorrect regarding Chondrichthyes?
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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
answer is D.
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Detailed 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.