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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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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