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Question

Chondrichthyes is characterised by

A
Placoid scale
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B
Placoid scale and ventral mouth
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C
Ventral mouth
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D
Ctenoid scale and ventral mouth
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Solution

The correct option is B Placoid scale and ventral mouth
Chondrichthyes (cartilaginous fishes) are marine. Their mouth is ventral and they have cartilaginous endoskeleton. Dermal placoid scales are present in them. E.g., Scoliodon, Pristis etc.

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