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Indicators of pollution - class-XI
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Some organisms are sensitive to different levels of air pollution and are used as pollution-indicators. Suggest which among the following fits into the category
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A
Lichens
💡 Explanation:
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 are not growing, it indicates that the air is heavily polluted with sulphur dioxide and other pollutants.
Thus, the correct answer is option D.