Many biological species can define a trait or characteristic of the environment thus labelled as “Indicator species”. Consider the following statements with this respect:
1. Lichens are indicators of air pollution
2. Certain Molluscs are indicators water pollution status
3. Certain mosses are indicators of soil pollution
Which among the above is / are correct?

Answer: [D] 1, 2 & 3

An indicator species is that species, whose presence defines a specific environmental condition, trait or characteristic.

This question is a part of GKToday's Integrated IAS General Studies Module