A: In the morula stage,the cells divide witho | vedclass

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(A) During the cleavage process,the zygote undergoes rapid mitotic divisions to form a solid ball of cells called the morula.In this stage,the total v

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) During the cleavage process,the zygote undergoes rapid mitotic divisions to form a solid ball of cells called the morula.In this stage,the total volume of the embryo does not increase because the cells divide without any growth in size,meaning the cytoplasm is partitioned into smaller cells called blastomeres.Since the embryo is enclosed within the zona pellucida,which does not expand during these early divisions,the overall size remains constant until the blastocyst stage.Therefore,both the Assertion and the Reason are correct,and the Reason explains why the cells do not increase in size (due to the constraint of the zona pellucida).

$A$: In the morula stage,the cells divide without any increase in size.
$R$: The zona pellucida remains intact until cleavage is completed.

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$A$: In the morula stage,the cells divide without any increase in size.$R$: The zona pellucida remains intact until cleavage is completed.