Question

N₂ -> NH₃:  

A. ammonification;  

B. denitrification;  

C. nitrification;  

D. nitrogen fixation;  

E. assimilation.

Answer 1

D, Nitrogen fixation -

It is the process by which atmospheric nitrogen (N2) is converted in to ammonia (NH3). In nature, there are non - biological (by lighting) and biological (by microorganisms) type of nitogen fixation.

Nitrification is the process of conversion of ammonia to nitrate.

Assimilation is the absorption of ammonia and nitrate by plants.

Ammonificaion is the process in which breakdown of dead organisms returns nitrogen to soil as ammonia.

Denitrification is the conversion of ammonia back to nitrogen gas.