Question

DCMU kills the weed because it inhibits:

• A. Non cyclic Phosphorylation
• B. Cyclic Photophosphorylation
• C. Dark Reaction
• D. Photorespiration

Answer 1

The correct option is A Non cyclic Phosphorylation

Non-cyclic photophosphorylation or Z-scheme is inhibited by CMU and DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea). DCMU is a herbicide which kills the weed by inhibiting ${\mathrm{CO}}_2$ fixation as it is a strong inhibitor of PS-II. PS-II is not active during cyclic photophosphorylation.