DMPQ: What is Nitrogen cycle. Explain its various stages. (science)

The nitrogen cycle is a complex biogeochemical cycle in which nitrogen is converted from its inert atmospheric molecular form (N2) into a form that is useful in biological processes.

The Nitrogen cycle contains various stages:

  • Nitrogen fixation:

Inert form of Nitrogen is fixed and converted into organic form in a process called nitrogen fixation. Most atmospheric nitrogen is fixed through biological process.  Bacteria, free anaerobic bacteria and algae converts it nitrogen into ammonia(NH4+). An enzyme nitrogenase is used to fix nitrogen.