Which type of scales are found on the skin of cartilaginous fishes?

Ganoid

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Placoid

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Ctenoid

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Cycloid

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Solution

The correct option is B Placoid
In cartilaginous (chondrichthyes) fishes placoid scales are present which are pointed and are tooth shaped. Placoid scales are supported by spines, and grow flat with their tips facing backward. This type of scales are present in sharks and rays. Cycloid, ctenoid and ganoid scales are observed in bony (ostrichthyes) fishes.

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