Question Details

Detailed explanation and options for the selected question.

What is the role of lichens in an ecosystem?

A. They fix atmospheric nitrogen
B. They act as bioindicators of air quality
C. They decompose organic matter
D. They are predators of herbivores

Explanation:

Lichens are bioindicators sensitive to air pollution. They do not fix nitrogen, decompose organic matter, or act as predators.