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Question
Placoid scales are formed in
Placoid scales are formed in
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Solution
The correct option is A Cartilaginous fishes
Cartilaginous fishes like Sharks, rays and chimaeras have toothlike scales called as dermal denticles or placoid scales. Denticles provide two functions, protection and in most cases streamlining. Placoid scales are structurally homologous with vertebrate teeth, having a central pulp cavity supplied with blood vessels, surrounded by a conical layer of dentine. Hence, option A is correct answer.
Cartilaginous fishes like Sharks, rays and chimaeras have toothlike scales called as dermal denticles or placoid scales. Denticles provide two functions, protection and in most cases streamlining. Placoid scales are structurally homologous with vertebrate teeth, having a central pulp cavity supplied with blood vessels, surrounded by a conical layer of dentine. Hence, option A is correct answer.
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