Placoid scales are present in:
Correct answer: C. Class chondricthyes
- A. Class cyclostomata
- B. Class osteichthyes
- C. Class chondricthyes
- D. Ceplialochordate
Explanation
Placoid scales are a unique type of scales that are present in cartilaginous fishes like sharks and rays. These scales have a characteristic tooth-like structure with a hard enamel-like surface. They are embedded in the skin and provide protection and reduce drag in the water. The presence of placoid scales is one of the distinguishing features of the class Chondrichthyes, which includes sharks, rays, and skates.
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