A) placoid
B) canoid
C) cycloid
D) sysamoid
Correct Answer: A
Solution :
Placoid scales are found in cartilaginous fishes (Chondnchthyes). Each placoid scale contains a spine which directs towards back. It arises from a basal plate which is embedded in skin dermis. A pulp cavity occurs inside the spine which opens through basal plate.You need to login to perform this action.
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