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Q.

Teeth of sharks are modified

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a

placoid scales

b

cycloid scales

c

ctenoid scales

d

ganoid scales

answer is A.

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Detailed Solution

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In Chondrichthyes (e.g., sharks, skates and rays), teeth are modified placoid scales. Placoid scales are also called dermal denticles and are homologous to vertebrate teeth. 

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Teeth of sharks are modified