Question

Shell in a mollusc is

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

Answer 1

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.