Consider the following:
1. Wild animals
2. Lichens and Mosses
3. Insects
4. Microbes
Which among the above can cause Biological weathering?

Answer: [D] 1, 2, 3 & 4

All of the above can cause biological weathering. Lichens and mosses grow on essentially bare rock surfaces and create a more humid chemical microenvironment. The attachment of these organisms to the rock surface enhances physical as well as chemical breakdown of the surface microlayer of the rock.

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