Class elasmobranch have an exoskeleton of
Correct answer: A. Placoid scales
- A. Placoid scales
- B. Cycloid scales
- C. Ctenoid scales
- D. Ganoid scales
Explanation
This is the correct answer. Elasmobranchs, which include sharks, rays, and skates, have a unique type of exoskeleton called placoid scales. These scales are small, tooth-like structures embedded in the skin, providing protection and streamlining the body for swimming.
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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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