What is the mechanism of action by which the herbicide paraquat kills plants?
A)It competes with ferredoxin for electrons from the PSI reaction center.
B)It interferes with PSI function.
C)Electrons attached to paraquat are used to reduce oxygen, generating highly reactive oxygen radicals.
D)It leads to the production of substances that damage the chloroplasts and kill the plant.
E)All of these are correct.

Question

Quizplus · Accepted Answer

Paraquat kills plants by generating highly reactive oxygen radicals when electrons attached to it are used to reduce oxygen. This process interferes with Photosystem I (PSI) function, as paraquat competes with ferredoxin for electrons from the PSI reaction center. The reactive oxygen species produced can damage chloroplasts and other cellular components, leading to the plant's death. Therefore, all the mechanisms listed contribute to the herbicidal action of paraquat.

What Is the Mechanism of Action by Which the Herbicide