Which one of the following is a bio indicator of air pollution?

Detailed Solution:

The correct answer is “Lichen”.

Lichens are excellent bioindicators of air pollution because they don't thrive in polluted environments.

Lichens are miniature ecosystems made up of fungus, algae, and/or cyanobacteria. The algae or cyanobacteria live inside the fungus, providing sugars made from sunlight, while the fungus provides the home.