Question

Lichen is considered a good example of Obligate mutualism. Explain.

Answer 1

A lichen is an organism that results from a mutualistic relationship between a fungus and an algae. The other organism is usually a cyanobacterium or green alga. The fungus grows around the bacterial or algal cells. The fungus benefits from the constant supply of food produced by the photosynthesizer. The photosynthesizer benefits from the water and nutrients absorbed by the fungus.