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Question

Lichens are the indicators of the pollutant________.

A
Carbon Monoxide
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B
Mercury
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C
Nitrogen dioxide
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D
Sulphur dioxide
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Solution

The correct option is D Sulphur dioxide
Lichens are called very good pollution indicators particularly for sulfur dioxide because these species are susceptible to certain pollutants. Hence, they do not grow in polluted areas and are found growing well only in non-polluted areas. Therefore, Lichens are the indicators of pollutants or pollution.

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