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  4. The herbicide DCMU kills the weeds because it inhibits

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Q. The herbicide $DCMU$ kills the weeds because it inhibits

Photosynthesis in Higher Plants

Solution:

$DCMU$ (Dichlorophenyl dimethyl urea) is a herbicide which kills the weeds by inhibiting $CO_{2}$ fixation as it is a strong inhibitor of photosystem $II (P_{680}). DCMU$ acts by blocking electron flow at the guanine acceptors of $PS II$, by competing for the binding site of plastoquinone.