Exoskeleton of elasmobranchs is usually composed of

Placoid scales

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Cycloid scales

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Ganoid scales

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Ctenoid scales

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Solution

The correct option is B Placoid scales
The exoskeleton of Elasmobranchs is placoid. It consists of no continuous covering of scales of ganoid plates, but of more or less numerous detached grains, tubercles or spines, composed of bony of dentinal matter and scattered here and there in the integument.
So, the correct answer is option A.

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Similar questions

Give one example each for an animal possessing placoid scales and that with cycloid scales.

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