Class Elasmobranchi have an outer covering of?
Correct answer: A. Placoid scale
- A. Placoid scale
- B. Cycloid
- C. Ctenoid scales
- D. Epidermal scales
Explanation
The outer covering of Elasmobranchs is placoid. It consists of no continuous covering of scales of ganoid plates, but of more or less numerous detached grains, tubercles or spines, composed of bony of dentinal matter and scattered here and there in the integument.
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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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