Lichens are indicators of SO_2 pollution beca | vedclass

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(C) Lichens are composite organisms consisting of a symbiotic association between algae (phycobiont) and fungi (mycobiont).They are well-known as biol

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sensitive to $SO_2$.

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(C) Lichens are composite organisms consisting of a symbiotic association between algae (phycobiont) and fungi (mycobiont).They are well-known as biological indicators of air pollution,specifically sulfur dioxide $(SO_2)$.Lichens are highly sensitive to $SO_2$ and cannot grow in areas where the concentration of $SO_2$ is high.Therefore,their absence in a particular area serves as an indicator of $SO_2$ pollution.

Lichens are indicators of $SO_2$ pollution because they are ........

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