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Lichens are sensitive to sulphur dioxide pollution, hence they serve as bioindicators of pollution.

1. Mixing of alcohol with gasoline produces gasohol. Advantages of fuel blends are that alcohol helps to increase the octane rating and reduce carbon monoxide (CO) and other tailpipe emissions from the engine.
2. Silicosis is caused by exposure to dust containing silica.
3. Lichens are sensitive to sulphur dioxide pollution, hence they serve as bioindicators of pollution.
4. Habitat destruction affects the survival of populations and reduces biodiversity.

Correct answer: Lichens are sensitive to sulphur dioxide pollution, hence they serve as bioindicators of pollution.

Solution

Lichens are highly sensitive to sulphur dioxide pollution, making them effective bioindicators for monitoring air quality. This is a direct fact about lichens.

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