Lichens indicate SO_2 pollution because they | vedclass

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(C) Lichens are formed by a symbiotic relationship between algae or cyanobacteria and fungi.Lichens typically grow in various environments,but most li

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are sensitive to $SO_2$.

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(C) Lichens are formed by a symbiotic relationship between algae or cyanobacteria and fungi.Lichens typically grow in various environments,but most lichens,especially epiphytic fruticose species and those containing cyanobacteria,are highly sensitive to atmospheric pollutants.Specifically,they are unable to survive in areas with high concentrations of sulfur dioxide $(SO_2)$.Therefore,they are widely used as bio-indicators to monitor $SO_2$ pollution levels in the environment.

Lichens indicate $SO_2$ pollution because they

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