Question

Assertion : $2$, $4$-$D$ is extensively used in agricultural and horticultural practices.
Reason : $2$, $4$-$D$ is a herbicide.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (A)

$NAA$ (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. They are widely used as herbicides. $2$, $4$-$D$ is widely used to kill dicotyledonous weeds, it does not affect mature monocotyledonous plants. It is used to prepare weed-free lawns by gardeners.