NEET BIOLOGY

Detailed explanation-1: -The molluscs include many familiar animals, including clams, snails, slugs, and squid, as well as some less familiar animals, like tusk shells and chitons (Fig. 3.51 A). Molluscs are found in nearly all freshwater and marine environments, and some are found also on land.

Detailed explanation-2: -4. What are the four major mollusks? They are gastropods, bivalves, cephalopods, and scaphopods.

Detailed explanation-3: -Clams, oysters, snails, chitons, octopi, and squid are all members of the Phylum Molluska.

Detailed explanation-4: -Mollusks are soft-bodied invertebrates that belong to the phylum Mollusca. They are usually completely or partially encased in a calcium carbonate shell secreted by the soft mantle that surrounds the body. The two examples of mollusks are Pinctada (Pearl oyster) and Octopus (Devilfish).

Detailed explanation-5: -The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. The shell of these creatures is often what is recovered in a fossil dig.