Placoid scales are unique to

Teleosts

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Elasmobranchs

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Birds

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Armadillo

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Solution

The correct option is B Elasmobranchs
Placoid scales (dermal denticles) are tough scales, that cover the skin of elasmobranchs (sharks and rays). The function of these scales is for protection against predators, although in some sharks, they may also have a hydrodynamic function.

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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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