Assertion :The pollen tube is believed to release some stimulus for the increased growth in the ovary wall. Reason: The auxins can increase the activity of ovary even in the absence of pollen grain or pollen tube.

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.
The pollen tube releases stimulus for increased growth in ovary wall, which is the result of chemotropism. A pollen tube is part of the male gametophyte of seed plants. It acts as a conduit to transport the male gamete cells from the pollen grain, either from the stigma to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms.

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