Assertion : $2, 4$ -D is auxin commonly used in tissue culture. Reason: $2, 4$ -D is a weedicide.

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
2,4-D (2,4-dichlorophenoxyacetic acid), commonly classified as an auxin plant hormone derivative has been used in laboratories for plant research as a supplement in plant cell culture media. It is used in plant cell cultures as a dedifferentiation (callus induction) hormone.
Auxin like 2,4-D is widely used as a weedicide to kill dicotyledonous weeds and to prepare weed-free lawns by gardeners.
Hence, both Assertion and Reason are correct but Reason is not the correct explanation for Assertion. (Option B)

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Assertion :2,4-D is auxin commonly used in tissue culture. Reason: 2,4-D is a weedicide.

Assertion : $2, 4$ -D is auxin commonly used in tissue culture. Reason: $2, 4$ -D is a weedicide.