Question

DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea)

• A. Inhibits PS- I
• B. Inhibits PS- II
• C. Destroys chloroplast
• D. Inhibits oxidative phosphorylation

Answer 1

The correct option is B Inhibits PS- II

DCMU is an herbicide that inhibits photosynthesis by blocking the plastoquinone binding site of photosystem II and thus, disallowing the electron flow from where it is generated, in photosystem II, to plastoquinone. This interference reduces the ability of the plant to turn light energy into chemical energy. Thus, the correct answer is option B.