Question

Herbicides such as 2,4-D and MCPA, which selectively kill broadleaf weeds without harming grassy (monocot) crops like wheat and maize, belong to which chemical group and mode-of-action classification?

A Phenoxy compounds — Synthetic auxins
B Triazines — Photosynthesis inhibitors
C Sulfonylureas — ALS inhibitors
D Dinitroanilines — Mitotic inhibitors
E Bipyridyliums — Contact herbicides
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