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      Question

      What will be the colour reaction with iodine of a plant

      kept in dark for few days?
      A White Correct Answer Incorrect Answer
      B Deep blue Correct Answer Incorrect Answer
      C Yellow or brown Correct Answer Incorrect Answer
      D Green Correct Answer Incorrect Answer

      Solution

      If a plant is kept in the dark, it will not photosynthesize and starch cannot be produced, so the iodine test for starch will turn yellow or brown instead of deep blue.

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