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Which one of the following is the well-known example of bioindicator of air pollution?

  By GK Planet Team      
Q. Which one of the following is the well-known example of bioindicator of air pollution?
  1. Lichens
  2. Methyl mercury
  3. Rose plant
  4. Sunflower
Answer: Lichens
Lichen
A lichen is a composite organism that emerges from algae or cyanobacteria living among the filaments (hyphae) of the fungi in a mutually beneficial symbiotic relationship. The fungi benefit from the carbohydrates produced by the algae or cyanobacteria via photosynthesis.
The hardy lichens are useful bioindicators for air pollution, especially sulfur dioxide pollution since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil. It also helps that they are able to react to air pollutants all year round.

Why are lichens called pollution indicators?
Ans: Lichens are regarded as pollution indicators because they are sensitive to sulfur dioxide (SO2) and do not grow in polluted areas. Their presence indicates the absence of pollution in an area, and their absence indicates that the area is polluted.
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