Why are lichens called bio-indicators?
Lichens are called bio indicators as they indicate the environmental pollution through their gradual extinction in those regions where there is excessive pollution especially the air pollution.
write any six characteristics of lichens
the six characteristics of lichen are :
1.Lichen secrete lichenic acid that help in disintegration of rocks.
2.the plant body of the lichen is called thallus.
3.lichen show asexual, sexual and vegetative method of reproduction.
4.Vegetative reproduction take place by fragmentation ,decaying of older parts, lobules .
5.Asexual reproduction take place by formation of oidia .
6.Sexual reproduction take place by formation of male sex organ and female sex organ.