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Which is the useful biological indicator of sulphur dioxide pollution?
Which is the useful biological indicator of sulphur dioxide pollution?
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Lichens are considered useful biological indicators of sulfur dioxide (SO2) pollution. Lichens are composite organisms consisting of a fungus and a photosynthetic partner (usually algae or cyanobacteria) living together in a symbiotic relationship. They are highly sensitive to air pollution, especially sulfur dioxide.
Lichens do not have roots and obtain nutrients and water directly from the air and rain. When exposed to sulfur dioxide in the air, lichens can absorb and accumulate sulfur dioxide and sulfur dioxide-derived compounds. This accumulation can lead to changes in their growth rates, morphology, and even death in highly polluted areas. Therefore, studying the presence, diversity, and health of lichen populations can provide valuable insights into the level of sulfur dioxide pollution in an environment.