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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 dioxideย  . 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.ย 

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