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    Question

    Electron transport inhibition in PS-II (Photosystem II)

    for herbicidal action is observed in
    A Nitriles Correct Answer Incorrect Answer
    B Ureas Correct Answer Incorrect Answer
    C Triazines Correct Answer Incorrect Answer
    D All the above Correct Answer Incorrect Answer

    Solution

    Photosynthetic Inhibitors control many broadleaf and some grass weeds. In general, these herbicides inhibit photosynthesis by binding to D1 proteins of the photosystem II complex in chloroplast thylakoid membranes. Herbicide binding at this protein blocks electron transport and stops CO2 fixation and production of energy needed for plant growth. These include Nitriles, Ureas, triazines, phenylcarbamates,  etc.

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