A particular city's air could be polluted with high concentrations of pollutants such as SO $_{2}$ . The presence of which organism you will likely look for to predict whether the city's air is polluted or not?

Algae

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Bacteria

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Lichens

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Virus

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Solution

The correct option is D Lichens
Lichens are used as the indicators of air pollution. These structures grow on tree bark and rocks. Air pollutants which are in the gaseous forms get dissolved in the rainwater, especially SO $_{2}$ (sulphur dioxide) can damage lichens, and check them from growing. In places where lichens do not grow, it indicates that the air is heavily polluted with sulphur dioxide and other pollutants.
Thus, the correct answer is option C.

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A particular city's air could be polluted with high concentrations of pollutants such as SO2. The presence of which organism you will likely look for to predict whether the city's air is polluted or not?

A particular city's air could be polluted with high concentrations of pollutants such as SO $_{2}$ . The presence of which organism you will likely look for to predict whether the city's air is polluted or not?