Question

Which of the following is a dicot weedicide?
A. 2,4 -D
B. NAA
C. IBA
D. IAA

Answer 1

It is a synthetic auxin chemical compound that acts as a herbicide and a defoliant that is effective at very low doses. It induces uncontrollable and unsustainable growth and ultimately kills them.

Complete answer: 2,4-Dichlorophenoxy acetic acid is an organic compound with a formula ${C_8}{H_6}C{l_2}{O_5}$. It is a systemic herbicide that mainly acts on broad leaves weeds by causing uncontrolled growth in them. It is one of the most common herbicides/weedicides and defoliant that can be used. It does not affect most grasses, cereals, lawn turf, and grasslands. It is the first compound that acts as a herbicide at very low doses that particularly affect dicot broadleaf weeds. It is a chemical analog of auxin that induces uncontrollable and lethal growth in plants. It has low to moderate acute toxicity. It is a chemical that belongs to the phenoxy family of herbicides.
Hence, the correct answer is option A.

Additional information: 2,4-Dichlorophenoxy acetic acid is the oldest and one of the most effective defoliants available in the world. It has been commercially available since 1945. Over 1,500 herbicide products contain 2,4-D as an active ingredient.

Note: 2,4 -Dichlorophenoxy acetic acid enhances the storage life and the quality of fruits. It also acts as a secondary plant growth regulator. It is a white to brown crystalline solid. It acts on a variety of terrestrial and aquatic broadleaf weeds.