Mollusks: Types and Characteristics

Mrs. Young introduces mollusks, highlighting their soft bodies, often protected by shells. She explains their anatomy, including the mantle, foot, and open circulatory system. The video covers three types of mollusks: gastropods, bivalves, and cephalopods, detailing their unique characteristics and behaviors. Gastropods like snails and slugs have one or no shell and move using a mucus trail. Bivalves, such as clams and scallops, have two shells and are filter feeders. Cephalopods, including squid and octopus, have tentacles for capturing prey and are carnivorous.

What is a common feature of mollusks?

• Segmented bodies

• Hard outer shell

• Feathers

• Exoskeleton

What is the function of the mantle in mollusks?

• To filter food

• To capture prey

• To aid in movement

• To cover internal organs

How does the circulatory system of mollusks differ from that of humans?

• It is closed with blood vessels

• It lacks a heart

• It is open with blood flowing freely

• It has multiple hearts

Which of the following is NOT a type of mollusk?

• Gastropods

• Cephalopods

• Bivalves

• Arthropods

What is a characteristic of gastropods?

• They move using a broad foot

• They are filter feeders

• They have tentacles

• They have two shells

What helps snails move more easily?

• Their hard shell

• Their tentacles

• Their slime trail

• Their strong muscles

What is unique about bivalves?

• They have tentacles

• They are carnivores

• They have two shells connected by hinges

• They have a single shell

How do bivalves obtain their food?

• By hunting prey

• By photosynthesis

• By filtering water

• By scavenging

What is a feature of cephalopods?

• They are herbivores

• They have two shells

• They have tentacles around their mouth

• They have a broad foot for movement

Which of the following is an example of a cephalopod?

• Snail

• Octopus

• Clam

• Slug