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    Which of the following plants can be used as indicators of sulphur dioxide pollution in air?
    Question

    Which of the following plants can be used as indicators of sulphur dioxide pollution in air?

    A.

    Liverworts

    B.

    Hornworts

    C.

    Epiphytic Lichens

    D.

    Ferns

    Correct option is C

    Epiphytic lichens are highly sensitive to air pollution, especially sulphur dioxide (SO₂). A decline or absence of lichens in an area is a strong indicator of air pollution levels.

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