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Question
Which class shows 8 dorsal plates of shell?
Which class shows 8 dorsal plates of shell?
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Solution
The correct option is A Amphineura
Class Amphineura are all marine. There is present a non-ganglionated nerve ring around the mouth with two pairs of interconnected nerve cord. Head is reduced and without eyes and tentacles. The shell consists of a row of 8 plates. For example, Chiton which is commonly known as the coat of mail shell. Monoplacophora includes primitive mollusc, Neopilina and its shell is spoon or cup-shaped. Scaphopoda includes Dentalium which has a worm-like a body enclosed in a curved tubular shell open at both ends. In cephalopods, the shell is often internal or reduced. It may be external as in Nautilus or absent as in Octopus.Thus, the correct answer is option A.
Class Amphineura are all marine. There is present a non-ganglionated nerve ring around the mouth with two pairs of interconnected nerve cord. Head is reduced and without eyes and tentacles. The shell consists of a row of 8 plates. For example, Chiton which is commonly known as the coat of mail shell.
Monoplacophora includes primitive mollusc, Neopilina and its shell is spoon or cup-shaped.
Scaphopoda includes Dentalium which has a worm-like a body enclosed in a curved tubular shell open at both ends.
In cephalopods, the shell is often internal or reduced. It may be external as in Nautilus or absent as in Octopus.
Thus, the correct answer is option A.
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