Assertion :Torison can be seen in ctendium. Reason: Ctenidium acts as the respiratory organ.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. Ctenidium is a gill situated on the right side of the branchial chamber. It helps in respiration by beating cilia. During development, ctenidium shifts from left side to right side which is called as torison. It is characteristic feature of gastropods.