Which one of the following chemicals is commonly used by farmers to destroy weeds ?

2,4-D (2,4-dichlorophenoxyacetic acid) is a widely used systemic herbicide employed by farmers to destroy weeds [1]. It functions as a synthetic auxin, causing uncontrolled growth in broadleaf weeds (dicots) while leaving most grasses (monocots) unharmed [3]. In contrast, DDT and Malathion are primarily classified as insecticides used to control mosquitoes and agricultural pests [t4]. Methyl bromide is a soil fumigant and nematicide used to treat soil before planting [1][t2]. While DDT was historically used in agriculture, its use is now heavily restricted or banned in many regions due to its persistence and bio-magnification in the food chain [t2]. 2,4-D remains one of the most common chemicals for weed management in field, fruit, and vegetable crops globally [t1][t7].

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 5: Environmental Pollution > 3) Agricultural sources: > p. 74
2. [3] https://www.epa.gov/ingredients-used-pesticide-products/24-d