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Q.

The scales of Scoliodon are

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a

ctenoid

b

cycloid

c

cosmoid 

d

placoid

answer is D.

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Detailed Solution

The skin of cartilaginous fishes (e.g., Scoliodon) is tough, containing minute placoid scales. 

Cycloid, ctenoid and cosmoid scales are found in bony fishes (Osteichthyes).

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