Which of the following is an air pollution indicator?

Fungi

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Red algae

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Lichens

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Brown algae

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Solution

The correct option is C Lichens
Lichens are sensitive to air pollution because the algal partner absorbs most of the nutrients from the air. If the air has an increased amount of sulfur dioxide, a poisonous compound is formed in lichens that result in their death.
Hence, the correct answer is 'Lichens'

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