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      Question

      Lichens are sensitive to which air

      pollutant?
      A Carbon monoxide Correct Answer Incorrect Answer
      B Methane Correct Answer Incorrect Answer
      C Sulphur dioxide Correct Answer Incorrect Answer
      D More than one of the above Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      Solution

      Lichens are sensitive to air pollution, particularly sulphur dioxide, which is harmful to their growth.

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