Question

Microorganisms also play an important role in the soil formation?Explain?

Answer 1

There are some bacteria and blue-green algae, which fix the atmospheric nitrogen into soil and thereby, increase the fertility of soil. They are known as biological nitrogen fixers.

One such bacterium is Rhizobium, which is found in the root nodules of leguminous plants like pulses. It lives in symbiotic association with plants and fixes the atmospheric nitrogen in leguminous plants.