EVERYDAY SCIENCE

Detailed explanation-1: -Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs. In many species, the mantle produces a hard shell . Not all molluscs produce a shell. Many molluscs have a radula, which, in most species, is a rasp-like scraping organ used in feeding (Fig. 3.54).

Detailed explanation-2: -Molluscs are a clade of organisms that all have soft bodies which typically have a “head” and a “foot” region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons.

Detailed explanation-3: -(7) The body is soft and unsegmented. (8) The soft body is covered by a fleshy fold of the body wall. It is called mantle. (9) The molluscs are provided with one or two calcareous shells.

Detailed explanation-4: -mol·lusk ˈmä-ləsk. variants or mollusc. : any of a large phylum (Mollusca) of invertebrate animals (such as snails, clams, or squids) with a soft unsegmented body usually enclosed in a calcareous shell. broadly : shellfish.

Detailed explanation-5: -mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.