Herbicides are chemicals used to kill or inhibit the growth

Last updated: 10/23/2023

Herbicides are chemicals used to kill or inhibit the growth of unwanted plants and weeds Many herbicides work by blocking electron carriers or reducing their ability to carry electrons in the light dependent reactions One such chemical is DCMU 3 3 4 dichlorophenyl 1 1 dimethylurea DCMU is an algaecide and herbicide that works by blocking the electron binding site of plastoquinone This means that photosystem II is unable to transfer electrons from the splitting of water to plastoquinone This effectively shuts down the linear flow of electrons in the light dependent reactions a Identify the molecule produced in the light dependent reactions that would be most affected by the shutting down of linear electron flow b Connect how the molecule affected in part a is used in the Calvin cycle c Describe what would effectively happen to the Calvin cycle as a result of exposure to DCMU