Assertion :
In morula stage the cells divide without any increase in size.
Reason
Reason:
Zona pellucida remains intact till cleavage is completed.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In the Morula stage, the cells divide without any growth phase. The cells get smaller in size without a growth phase.
Zona pellucida does not remain intact till the cleavage. It degenerates after the entry of sperm.
So, the correct option is 'A is true, R is false'.

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