Multiple choice

What type of interaction is exhibited by lichens?

  1. Parasitism

  2. Symbiosis

  3. Commensalism

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lichens represent a mutualistic symbiotic relationship between fungus and algae/cyanobacteria. The fungus provides structure and moisture retention while the photosynthetic partner produces food. Parasitism harms one partner, commensalism benefits only one, and lichens clearly demonstrate mutualism.