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    Question

    Paragraph for question 21 to 24 Herbicides are chemical substances used to control or kill unwanted plants (weeds). They can be classified into selective herbicides, which target specific plant species without affecting others for example a and non-selective herbicides, which kill all vegetation they come into contact with. Herbicides can also be categorized by their mode of action, such as contact herbicides, which kill only the plant parts they touch, or systemic herbicides, which are absorbed and transported throughout the plant, killing it entirely.

     What is the primary time of application for a

    pre-emergence herbicide?
    A 10 to 15 days before sowing of crop Correct Answer Incorrect Answer
    B 1 to 2 days after sowing of crop c. Correct Answer Incorrect Answer
    C 10 to 15 days after sowing of crop Correct Answer Incorrect Answer
    D It can be applied any time before emergence of weeds Correct Answer Incorrect Answer
    E Before the sowing season of crop Correct Answer Incorrect Answer

    Solution

    Pre-emergence herbicides are applied before weed seeds germinate, often right after planting crops, to create a barrier that prevents weeds from growing. Therefore they have to be applied 1 to 2 days after sowing of crop.

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