The herbicide Metsulfuron methyl belongs to the group:

Correct option is C

The correct answer is (C) Sulfonylureas

Explanation:
• Metsulfuron-methyl is a systemic herbicide belonging to the Sulfonylurea chemical family.
• It acts by inhibiting the enzyme acetolactate synthase (ALS), which is essential for the synthesis of branched-chain amino acids (valine, leucine, and isoleucine).
• It is widely used for controlling broad-leaved weeds in wheat and other cereals.

Information Booster:
• Other Sulfonylureas: Sulfosulfuron, Bensulfuron-methyl, Chlorimuron-ethyl.
• Characteristic feature: They are effective at extremely low application rates (grams per hectare).

Additional Knowledge:
• Pyridinones (Option A): Includes herbicides like Fluridone.
• Phenols (Option B): Includes older contact herbicides like DNOC.
• Oxidiazoles (Option D): Includes Oxadiazon.