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Water Canal System

Assertion : I...

Question

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.

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Q. Assertion :In morula stage, cells divide without increase in size. Reason: Zona pellucida remain undivided till cleavage is complete.

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