A: The mantle of a pearl oyster is three-laye | vedclass

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Question

(B) The mantle of a pearl oyster consists of three distinct layers: the outer periostracum,the middle prismatic layer,and the inner nacreous layer. Th

Vedclass · Accepted Answer

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

Vedclass · Answer

(B) The mantle of a pearl oyster consists of three distinct layers: the outer periostracum,the middle prismatic layer,and the inner nacreous layer. Thus,the Assertion is true.Nacre-secreting cells (also known as mantle epithelial cells) are indeed located just below the nacreous layer to facilitate its formation. Thus,the Reason is also true.However,the fact that nacre-secreting cells are located below the nacreous layer does not explain why the mantle itself is composed of three layers. Therefore,the Reason is not the correct explanation for the Assertion.

$A$: The mantle of a pearl oyster is three-layered.
$R$: Nacre-secreting cells are present just below the nacreous layer.

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$A$: The mantle of a pearl oyster is three-layered.$R$: Nacre-secreting cells are present just below the nacreous layer.