AIIMS 2018 Botany Plant Hormones MCQ Question

Option B is correct because 2,4-Dichlorophenoxyacetic acid (2,4-D) is a synthetic auxin that selectively targets and disrupts the growth of dicot weeds, not monocots. This selective herbicide mimics natural auxins, leading to uncontrolled growth and eventual death in susceptible plants, which primarily include dicots. Other options are not relevant as they do not provide any additional information or context regarding the role of auxins or the action of 2,4-D in plant physiology. Understanding the specificity of herbicides like 2,4-D is crucial for effective weed management in agricultural practices.