Assertion :
Up to morula stage, the cells divide without any increase in size.
Reason: Zona pellucida remains intact till cleavage is complete.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
A morula is distinct from a blastocyst in that a morula (3–4 days after fertilization) is a 16-cell mass in a spherical shape whereas a blastocyst (4–5 days after fertilization) has a cavity inside the zona pellucida along with an inner cell mass. A morula, if untouched and allowed to remain implanted, will eventually develop into a blastocyst.
So the correct option is ' If both A and R are true and R is not the correct explanation of A'.

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