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      Question

      The herbicides which are ineffective on perennial plants

      that are able to regrow from roots or tubers.
      A Contact herbicides Correct Answer Incorrect Answer
      B Systemic herbicides Correct Answer Incorrect Answer
      C Soil bome herbicides Correct Answer Incorrect Answer
      D Pre – emergent herbicides Correct Answer Incorrect Answer

      Solution

      Contact herbicides affect only the part of the plant to which they are applied. Systemic herbicides are absorbed and moved around the plant and thus would be effective on perennials.

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