Lichens are Generally Described as Which Type of Symbiotic Relationship

Question

Lichens are generally described as which type of symbiotic relationship?  
A) Mutualism
B) Commensalism
C) Parasitism
D) Competition
E) Amensalism

Accepted Answer

Lichens are a mutualistic symbiotic relationship between fungi and algae or cyanobacteria. The fungi provide a protective structure and absorb nutrients from the environment while the algae or cyanobacteria provide energy through photosynthesis.