Which of the following auxins are widely used as herbicides?

2, 4-D and 2, 4, 5-T

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2, 4-D and cytokinin

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2, 4-D and 2, 4-T

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2, 4, 5-T and GA

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Solution

The correct option is A 2, 4-D and 2, 4, 5-T
Auxins like indole-3-acetic acid (IAA) and indole butyric acid (IBA) have been isolated from plants. NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic acid) are synthetic auxins. All these auxins have been used extensively in agricultural and horticultural practices. Auxins are widely used as herbicides. 2, 4-D and 2,4,5-T are commonly used to kill dicotyledonous weeds, it does not affect mature monocotyledonous plants. It is used to prepare weed-free lawns by gardeners.
Thus, the correct answer is option A.

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