Lichens are very sensitive to the levels of contaminants in air, particularly________.

Carbon dioxide

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Sulphur dioxide

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Methane

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Chlorofluorocarbons

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Solution

The correct option is B Sulphur dioxide
Lichens are the association between an algae and fungus that live symbiotically with each other and are benefited by their association. Algae prepare food for the fungi and fungi absorb nutrients from the soil. Lichens are very sensitive towards air pollutants like sulphur dioxide and do not grow in polluted areas.

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