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B
PS- II
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C
Calvin cycle.
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D
Krebs cycle.
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Solution
The correct option is B PS- II DCMU or (3-(3,4-dichlorophenyl)-1,1-dimethylurea) is a common herbicide. DCMU is an inhibitor of photophosphorylation. DCMU competes with plastoquinone (QB) for binding site in PS- II.