Question

what is nitrogen cycle? draw a schematic representation of nitrogen cycle?​

Answer 1

Answer:

Hope this answer is helpfull to you

Answer 2

Nitrogen cycle:-

$\arrow$Nitrogen is a vital element.

$\arrow$It is a part of most of the cellular components like proteins, nucleic acids (DNA and RNA), vitamins, etc.

$\arrow$It is also a major constituent of chlorophyll in plants. Plants obtain their nitrogen from the soil while animals obtain it from plants.

$\arrow$A cycle of processes helps in maintaining the concentration of nitrogen in the atmosphere and meet the requirement of every organism.

$\arrow$This cycle of nitrogen is called the nitrogen cycle.

$\arrow$The nitrogen cycle is the recycling and reusing of nitrogen in different forms to meet the demand for various environmental activities.

$\arrow$This happens through various processes with the help of certain microorganisms.

$\arrow$In the atmosphere, nitrogen is available in a diatomic form i.e. N2.

$\arrow$Plants and certain organisms can’t use nitrogen in this form. Therefore N2 is converted into nitrogen oxides like NO, NO2, NO3.

$\arrow$Various processes like lightning; industrial combustion, forest fire etc. contribute to these oxides.

Process of nitrogen cycle:-

• Ammonification: Ammonia is obtained from dead and decaying plants and animals by decomposition. This process is called ammonification.

• Nitrification: In this step, ammonia obtained is first converted to nitrite (NO2) by bacteria like Nitrosomonas,  Nitrococcus, etc. and then to nitrate (NO3) by Nitrobacterium. Bacteria involved in nitrification are called chemoautotrophs.  
• Here is the reaction involved in the process of Nitrification.

• 2 NH3 + 3O2 ―→ 2NO2– + 2H+ + 2H2O