Q. Lichen is an association between which of the two? Answer:
Algae and fungus
Notes: A lichen is an organism that is formed by the symbiotic association of a fungus and an algae or cyanobacterium. A lichen has 95% of fungi and only 5% of algae by its mass. It occurs as crusty patches or bushy growths on tree trunks, bare ground, etc.