Assertion : Torsion can be seen in ctenidium. | vedclass

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(B) Ctenidium is a comb-like respiratory organ found in mollusks,particularly gastropods.During the larval development of gastropods,a process called

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If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

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(B) Ctenidium is a comb-like respiratory organ found in mollusks,particularly gastropods.During the larval development of gastropods,a process called $Torsion$ occurs,which involves a $180^{\circ}$ rotation of the visceral mass,mantle,and shell.As a result of this torsion,the ctenidium (along with the anus and mantle cavity) shifts from its original posterior position to an anterior position.Therefore,the assertion that torsion is seen in the ctenidium is correct.The reason that the ctenidium acts as a respiratory organ is also a correct biological fact.However,the process of torsion is a developmental phenomenon and is not caused by the fact that the ctenidium functions as a respiratory organ.Thus,both statements are correct,but the reason is not the correct explanation for the assertion.

Assertion : Torsion can be seen in ctenidium.
Reason : Ctenidium acts as the respiratory organ.

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Assertion : Torsion can be seen in ctenidium.Reason : Ctenidium acts as the respiratory organ.