Question

Name one organism that is sensitive to sulfur dioxide pollution.

Answer 1

Lichens:

1. Lichens are organisms formed by the symbiotic relationship between a fungus and an alga.
2. They are found on the bark of trees as a thin greenish-white crust.
3. Lichens are very sensitive to sulfur dioxide and are unable to grow in regions with a high concentration of sulfur dioxide.
4. Thus, the distribution area of lichens is indicative of the levels of sulfur dioxide in the air.
5. Hence they are used as biological indicators of sulfur dioxide in the atmosphere.