A : Radula is a rasping organ found in all mo | vedclass

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(D) The Assertion is false because the radula is not present in all molluscs. Specifically,the radula is absent in the class $Pelecypoda$ (also known

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Both Assertion and Reason are incorrect.

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(D) The Assertion is false because the radula is not present in all molluscs. Specifically,the radula is absent in the class $Pelecypoda$ (also known as $Bivalvia$).The Reason is also false because the radula is not made of vitrodentine; instead,it is a ribbon-like structure that bears transverse rows of chitinous teeth.Therefore,both the Assertion and the Reason are incorrect.

$A$ : Radula is a rasping organ found in all molluscs.
$R$ : It is made up of vitrodentine.

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$A$ : Radula is a rasping organ found in all molluscs.$R$ : It is made up of vitrodentine.