Assertion : In morula stage, cells divide without increase in size. Reason : Zona pellucida remain undivided till cleavage is complete.
A
Both Assertion and Reason are true and Reason is a correct explanation of Assertion
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B
Both Assertion and Reason are true but Reason is not a correct explanation of Assertion
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C
Assertion is true but Reason is false
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D
Both Assertion and Reason are false
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E
Assertion is false but reason is true.
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Solution
The correct option is B Both Assertion and Reason are true but Reason is not a correct explanation of Assertion Zygote divide vertically to form two blastomeres. This is followed by a vertical division and a horizontal division. Now, several divisions occur forming equal sized blastomeres called morula. There is no increase in size of cells. Zona pellucida is a transparent non cellular layer surrounding egg cell. It remains undivided till the cleavage is complete.