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Question

Chondrichthyes is characterized by tooth-shaped–

A
Placoid scale with dorsal mouth
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B
Ctenoid scale with dorsal mouth
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C
Ctenoid scale with ventral mouth
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D
Placoid scale with ventral mouth
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Solution

The correct option is D Placoid scale with ventral mouth
Chondrichthyes is one of the class of superclass pisces, subphylum Vertebrata and phylum Chordata. The mouth of the members of class Chondrichthyes is located ventrally and the teeth are modified placoid which are backwardly directed.

So, the correct answer is option 'd'.

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