2,4-D is a _____.

Correct option is D

The correct answer is (d) A and B

Explanation:

• 2,4-D (2,4-Dichlorophenoxyacetic acid) is primarily known as a selective herbicide or weedicide.
• It is widely used to control broadleaf weeds in cereal crops like wheat and maize.
• Chemically, it is a synthetic auxin, which is a class of plant hormones or plant growth regulators.
• At high concentrations, it kills plants by causing uncontrolled growth (acting as a weedicide).
• At very low concentrations, it can be used to regulate certain physiological processes in plants.

• It was one of the components of 'Agent Orange' used during the Vietnam War.
• It is one of the oldest and most widely used herbicides in the world.

• These are chemicals like Cycocel that inhibit stem elongation, which 2,4-D (being an auxin) generally does not do.