Assertion :Environment signals such as light and gravity also affect phase or stage of growth Reason: Gravity and light leads to differential auxin concentration which is responsible for differential growth.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Plants can respond to gravity and light. Stems grow upward away from gravity and towards the light. Roots grow downward towards gravity and away from light. Auxin is a plant hormone that, in high concentrations, stimulates growth and elongation of cells in stems, while retarding the growth of root cells. When auxin is distributed uniformly throughout a stem, all sides of the stem grow at the same rate, thereby enabling the plant to grow toward light and away from gravity.
So, the correct option is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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