Question:
Which is used as an air pollution indicator?
Which is used as an air pollution indicator?
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Lichens are the canaries of ecosystems — their absence signals air pollution.
Updated On: Aug 11, 2025
- Algae
- Fungi
- Bacteria
- Lichens
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The Correct Option is D
Solution and Explanation
Lichens are symbiotic organisms (algae + fungi).
They are highly sensitive to air pollutants, especially sulphur dioxide.
If lichens are absent in an area, it may indicate high pollution levels.
They are called bioindicators due to this sensitivity.
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