Which of these is a bioindicator?

Lichens tracing the presence of pollution

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Fossil lichens

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Special type of litmus paper

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None of the above

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Solution

The correct option is B Lichens tracing the presence of pollution
The hardy lichens are useful bioindicators of air pollution, especially sulfur dioxide pollution since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil.

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Blue litmus will change into red litmus by which of these followings?

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