Introduction to Mollusks

The video tutorial introduces mollusks, a group of invertebrate animals within the phylum Mollusca, which includes about 110,000 species such as clams, mussels, oysters, scallops, and squid. Mollusks are characterized by their soft bodies and the presence of shells, which can be external or internal. Some mollusks, like clams and mussels, have two shells, while others, like snails, have a single shell. Slugs lack shells entirely. Cephalopods, a highly developed class of mollusks, have eyes and tentacles for capturing prey.

Which of the following animals is a member of the phylum Mollusca?

• Butterfly

• Spider

• Clam

• Frog

What is a common feature of mollusks?

• They have a soft body.

• They have scales.

• They have a backbone.

• They have feathers.

Which mollusk is known for having two shells?

• Snail

• Slug

• Clam

• Octopus

What distinguishes cephalopods from other mollusks?

• They have wings.

• They live on land.

• They have a head with eyes and tentacles.

• They have a hard shell.

Which of the following is a cephalopod?

• Mussel

• Squid

• Snail

• Slug