The herbicide DCMU kills the weeds because it inhibits __________.
respiration
CO2 fixation
cell division
NO2−3 uptake
A
cell division
B
NO2−3 uptake
C
respiration
D
CO2 fixation
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Solution
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DCMU (Dichlorophenyl dimethyl urea) is a herbicide which kills the weeds by inhibiting CO2 fixation as it is a strong inhibitor of photosystem II (P680).DCMU acts by blocking electron flow at the guanine acceptors of PS II, by competing for the binding site of plastoquinone.
So the correct option is B.
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