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Standard XII

Biology

Structure of Microsporangium

Assertion: Ta...

Question

Assertion: Tapetal cells usually possess dense cytoplasm and never more than one nucleus.
Reason: Tapetal cells undergo mitosis which generally involves division of nucleus but cytokinesis does not happen.

Both assertion and reason are correct and the reason is the correct explanation to the assertion

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Both assertion and reason are correct but the reason is an incorrect explanation to the assertion

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Only assertion is correct

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Only reason is correct

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Solution

The correct option is D Only reason is correct
Tapetum is the innermost layer of the anther wall. They provide nourishment to developing pollen grains. Its cells called tapetal cells contain dense cytoplasm generally along with more than one nucleus. Hence, the assertion is incorrect.

This polynucleate condition arises since nuclear division is not followed by cytokinesis. Hence, the reason is correct.

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Structure of Microsporangium

Standard XII Biology

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Assertion: Tapetal cells usually possess dense cytoplasm and never more than one nucleus. Reason: Tapetal cells undergo mitosis which generally involves division of nucleus but cytokinesis does not happen.

Assertion: Tapetal cells usually possess dense cytoplasm and never more than one nucleus.
Reason: Tapetal cells undergo mitosis which generally involves division of nucleus but cytokinesis does not happen.