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Phylum Mollusca: Anatomy and Physiology

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Questions and Answers

What is the primary function of the mantle in mollusks?

To support the visceral mass

To secrete and line the shell (correct)

To facilitate gas exchange

To create suction for locomotion

What is the characteristic feature of the Polyplacophora group?

Closed circulatory system

Shell composed of three layers

Presence of a radula reinforced with magnetite

Dorso-ventrally flattened body (correct)

What is the function of the metanephridia in mollusks?

To regulate the circulatory system

To support the digestive system

To facilitate gas exchange

To carry out excretion (correct)

What is the primary difference between the trochophore and veliger larva stages?

The presence of a shell in the veliger stage Signup and view all the answers

What is the characteristic feature of the heart in mollusks?

It has an atrium and ventricle Signup and view all the answers

What is the function of the ctenidia in mollusks?

To facilitate gas exchange Signup and view all the answers

What is the main difference between the shell of a gastropod and that of other mollusks?

It is always one piece (univalve) Signup and view all the answers

What is the result of torsion in gastropod development?

The loss of the right gill and kidney Signup and view all the answers

What is the purpose of the siphon in subclass Prosobranchia?

To separate incurrent from excurrent flow Signup and view all the answers

What is unique about the feeding behavior of some Opisthobranchia?

They show interesting and varied feeding behaviors Signup and view all the answers

What is the function of the mantle floor in subclass Pulmonata?

It contracts and fills the lung with air Signup and view all the answers

What is the main difference between the nervous system of cephalopods and that of other mollusks?

It is more complex and has a larger brain Signup and view all the answers

What is the function of chromatophores in cephalopods?

They allow for camouflage and communication Signup and view all the answers

What is the main difference between the reproduction of bivalves and that of other mollusks?

Gametes are discharged and carried out in the excurrent flow Signup and view all the answers

What is the main function of the ctenidia in bivalves?

They play an important role in both gas exchange and feeding Signup and view all the answers

What is the result of oysters filtering water?

They remove phytoplankton, algae, and other nutrients Signup and view all the answers