Question

Name and define association which is bio indicator of air pollution ?

Answer 1

hi friend...

Lichens are widely used as environmental indicators or bio-indicators.....

lichens are mutualistic associations of a fungus and an alga or cyanobacterium and occur as crusty patches or bushy growths on trees, rocks and bare ground. 

hope this helps u....

Answer 2

->Lichen is the bio indicator of air pollution.
->It is a symbiotic association between algae(phycobiont) and fungi(mycobiont) where algae provide food and fungi provide shelter as algae live in the filaments of fungi.