The most widely using artificial plant hormone for controlling weed is

NAA

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2,4-D

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IBA

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Ethylene

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Solution

The correct option is B 2,4-D
2, 4-dichlorophenoxyacetic (2, 4-D) is a synthetic auxin used to kill dicotyledonous weeds. Naphthalene acetic acid (NAA) is also a synthetic auxin but is not used to control weeds.
So, the correct answer is, '2, 4-D'.

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