EVERYDAY SCIENCE

Detailed explanation-1: -The phylum Mollusca is the second-largest animal phylum, with over 100, 000 species. 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).

Detailed explanation-2: -Cephalopods are a group of molluscs that include the pearly chambered Nautilus, squids, and the octopus.

Detailed explanation-3: -Slugs and snails belong to the Phylum Mollusca and are more closely related to octopi than insects. Mollusks are a large and diverse group of animals of worldwide distribution. The slugs and snails are much like some insects in their biology.

Detailed explanation-4: -The animals belonging to the phylum Mollusca are apple snail, pearl oyster, devil fish, tusk shell, etc. Hence correct answer is option A. Note: The alimentary canal of Mollusca is straight or u-shaped or coiled.

Detailed explanation-5: -bubble shells (order Cephalaspidea) Elysia chlorotica. nudibranchs (order Nudibranchia) pteropods (orders Gymnosomata and Thecosomata) sea hares (family Aplysiidae)