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B
cycloid
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C
placoid
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D
ganoid
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Solution
The correct option is C placoid The exoskeleton of fishes is made of scales. There are four different types of scales in fishes - placoid, ganoid, ctenoid and cycloid.
Minute scales embedded in the skin of sharks are called placoid scales.
Ganoid scales are found in fishes like gar.
Cycloid and ctenoid scales are advanced types of scales found in bony fishes. Cycloid scales are large, thin and round or oval in shape and exhibit growth rings. Ctenoid scales resemble cycloid scales but have comblike teeth on their overlapping edge.