RRB Group D 1-Dec-2013 Shift 1 Solved Paper

Nitrogen fixation is a process by which nitrogen in the Earth's atmosphere is converted into ammonia (NH3) or other molecules available to living organisms.
Atmospheric nitrogen or molecular dinitrogen (N2) is relatively inert; it does not easily react with other chemicals to form new compounds.
The fixation process frees nitrogen atoms from their triply bonded diatomic form (N≡N) to be used in other ways.