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Phylum Mollusca: Anatomy and Physiology
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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?

    <p>The presence of a shell in the veliger stage</p> Signup and view all the answers

    What is the characteristic feature of the heart in mollusks?

    <p>It has an atrium and ventricle</p> Signup and view all the answers

    What is the function of the ctenidia in mollusks?

    <p>To facilitate gas exchange</p> Signup and view all the answers

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

    <p>It is always one piece (univalve)</p> Signup and view all the answers

    What is the result of torsion in gastropod development?

    <p>The loss of the right gill and kidney</p> Signup and view all the answers

    What is the purpose of the siphon in subclass Prosobranchia?

    <p>To separate incurrent from excurrent flow</p> Signup and view all the answers

    What is unique about the feeding behavior of some Opisthobranchia?

    <p>They show interesting and varied feeding behaviors</p> Signup and view all the answers

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

    <p>It contracts and fills the lung with air</p> Signup and view all the answers

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

    <p>It is more complex and has a larger brain</p> Signup and view all the answers

    What is the function of chromatophores in cephalopods?

    <p>They allow for camouflage and communication</p> Signup and view all the answers

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

    <p>Gametes are discharged and carried out in the excurrent flow</p> Signup and view all the answers

    What is the main function of the ctenidia in bivalves?

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

    What is the result of oysters filtering water?

    <p>They remove phytoplankton, algae, and other nutrients</p> Signup and view all the answers

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