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Which of the following is the use of lichens in case of pollution?

1. They treat the polluted water
2. They act as bioindicators of pollution
3. They promote pollution
4. Lichens are not related with pollution

Correct answer: They act as bioindicators of pollution

Solution

Lichens are highly sensitive to pollutants, especially in the air, so they are commonly used to monitor environmental quality. Because they respond visibly to pollution, they serve as bioindicators rather than treating pollution or causing it.

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