Question

Describe all the steps of nitrogen cycle in nature.

Answer 1

Process of conversion of molecular nitrogen (N₂) into compounds of nitrogen is called as nitrogen fixation. Nitrogen fixation may be

(a) Industrial N₂-fixation like forest fires, Automobile, Exhaust, Haber’s process of NH₃ synthesis etc.

(b) Electrical N₂-fixation : Conversion of N₂ into No, NO₂, N₂O by lightning and UV- radiations.

(c) Biological N₂-fixation : Carried out by living beings Like-bacteria, BGA (Blue, Green Algae) etc.

Symbiotic N₂ fixation- 

• Most common symbiotic association observed is between Rhizobium bacteria and roots of leguminous plants (Gram,Pea etc.) 
• Small outgrowths called as nodules are formed on roots which, act as site of N₂^- fixation.