Lichens are considered as indicators of ${SO}_{2}$ pollution because

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they do not grow in ${SO}_{2}$ polluted areas.

they can tolerate air pollution.

they oxidize sulphur to sulphuric acid under aerobic conditions.

they love of grow in ${SO}_{2}$ polluted areas.

answer is B.

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Detailed Solution

Lichens are considered as best indicators of air pollution especially caused by vehicular discharges or industrial smokes. They are highly sensitive to sulphur dioxide pollution in air. Lichen thalli turning black is an indicator of high level of sulphur dioxide in atmosphere.

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