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    Question

    The mode of herbicide action wherein the weed plants are

    bleached white, is caused by which of the following herbicides?
    A Atrazine Correct Answer Incorrect Answer
    B Clodinafop propargyl Correct Answer Incorrect Answer
    C Pendimethalin Correct Answer Incorrect Answer
    D Tembotrione Correct Answer Incorrect Answer

    Solution

    Tembotrione is a broad spectrum post emergence herbicide that inhibits the activity of the 4 hydroxy-phenyl-pyruvate-dexygenase (4 HPPD) enzyme. The formation of carotenoid (plant pigments) is disrupted by the blockage of the enzyme. Depletion of carotenoids deprives chlorophyll - where photosynthesis takes place - of its protection against an overdose of light and this results in chlorophyll bleaching. Tembotrione is an active ingredient in Laudis

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