2,4-D, Dicamba, and Glyphosate are considered which type of growth regulators?

2,4-D, Dicamba, and Glyphosate are considered which type of growth regulators?

• A. Anti-gibberlation
• B. Auxin type
• C. Cytokinin-type
• D. Ethylene-type

Answer: (B)

These agents are described as auxin-type growth regulators because they mimic the natural plant hormone auxin, triggering abnormal growth patterns in weeds. Synthetic auxins like 2,4-D and Dicamba cause uncontrolled cell elongation and tissue damage, leading to the death of broadleaf weeds. Glyphosate, while a widely used herbicide, works through a different mechanism—blocking EPSP synthase in the shikimate pathway and not by acting as an auxin—so it isn’t an auxin-type growth regulator. The best fit among the choices is the auxin-type category, since the hallmark effect of these commonly known growth regulators is their auxin-mimicking action.

These agents are described as auxin-type growth regulators because they mimic the natural plant hormone auxin, triggering abnormal growth patterns in weeds. Synthetic auxins like 2,4-D and Dicamba cause uncontrolled cell elongation and tissue damage, leading to the death of broadleaf weeds. Glyphosate, while a widely used herbicide, works through a different mechanism—blocking EPSP synthase in the shikimate pathway and not by acting as an auxin—so it isn’t an auxin-type growth regulator. The best fit among the choices is the auxin-type category, since the hallmark effect of these commonly known growth regulators is their auxin-mimicking action.