Give the importance of lichens

cbse
biology

#1

The importance of lichens are :
(a) Lichens are the pioneer organisms. They corrode the rocks and accumulate a certain amount of minerals and organic matter.
(b) Litmus paper is prepared from the lichen Rocella tinctorea.
© Lichens can be used as indicator of air pollution.
(d) Some lichens are source of food for grazing animals.