Discussion
Lichens are bioindicators of which pollutant gas ?
Answer: A
Lichens are bioindicators of sulphur dioxide.
Lichens absorb water and dissolved substances directly from the air over their whole surface and have no means of excreting them. Sulphur dioxide damages their algal partner's chlorophyll, so lichens disappear from areas with SO2 pollution, and the variety of lichens present is used to map SO2 levels.
Carbon dioxide is used by the algal partner in photosynthesis, and lichens are not used as indicators of carbon monoxide or fluorine.
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