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      Question

      Which of the following is an indicator of SO2 (Sulfur

      dioxide) pollution in the air?
      A Algae Correct Answer Incorrect Answer
      B Fungi Correct Answer Incorrect Answer
      C Mosses Correct Answer Incorrect Answer
      D Lichens Correct Answer Incorrect Answer

      Solution

      These phycobionts in lichens are susceptible to Sulfur dioxide  . Lichens are the finest bio-indicators for air pollution, especially sulphur dioxide contamination, because they primarily obtain their vital nutrients and water from the atmosphere rather than the soil. 

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