A location with luxuriant growth of lichens on the trees indicates that the: 1) trees heavily infested 2) location is highly polluted 3) location is not polluted 4) trees are very healty

Lichens are biomonitors. That is they are indicators of air pollution or in other words are very sensitive to changes in the environment. The absence of lichens means air pollution in the area and hence luxuriant growth of lichens indicates that the location is not polluted. i.e. option 3.

Thanks and Regards

Apoorva Arora

IIT Roorkee

askIITians Faculty