Question

______ are used as indicators of sulphur dioxide pollutants

Answer 1

Lichens:

1. Lichens are well-known as sensitive air pollution indicators, especially for sulphur dioxide.
2. Lichens are considered excellent pollution indicators because they are susceptible to certain pollutants.
3. As a result, they do not thrive in polluted environments and can only be found in non-polluted environments.
4. Lichens are thus used to detect pollutants or pollution.

Final Answer: Lichens are used as indicators of sulphur dioxide pollutants.