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Question

Shell in a mollusc is

A
chitinous and secreted by the mantle
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B
calcareous and secreted by visceral mass
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C
calcareous and secreted by the mantle
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D
siliceous and secreted by the mantle
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Solution

The correct option is C calcareous and secreted by the mantle
Molluscs are soft-bodied animals that have a protective calcareous shell covering it. This shell is secreted by a soft, spongy layer called mantle that lies over the visceral hump, also called the visceral mass. The shell is calcareous as it is made up of calcium carbonate.

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