Question

explain nitrogen cycle.

Answer 1

there are 5 steps in the nitrogen cycle 

1)Nitrogen fixation
2)Assimilation
3)Ammonification
4)Nitrification
5)Denitrification
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1)Nitrogen fixation

in this step, nitrogen is fixed r by microorganisms to the soil and the fixation of nitrogen is done by symbiotic bacteria and some other microorganisms

2)Assimilation

in this  process, the plants take up the nitrogen present in the soil for their own purpose and other organisms get nitrogen by consuming plants, amino acids etc
3)Ammonification

When a plant or animal dies, the nitrogen will be in organic form and the microorganisms like bacteria or fungi convert the organic nitrogen into ammonia 

4)Nitrification

In this step, ammonium is converted into Nitrate by nitrifying bacteria and there are many reactions taking place during the conversion

5)Denitrification

In this process, nitrate is converted into nitrogen gas which completes the nitrogen cycle

Answer 2

The processes involved in a complete nitrogen cycle are as follows :-

1. Nitrogen fixation
2. Ammonification
3. Assimmilation.
4. Nitrification
5. Denitrification.

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EXPLANATION
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1. NITROGEN FIXATION : -
In this process Atmospheric nitrogen is converted into the usable form by lightning strikes.

2. AMMONIFICATION : -
In this process plants and animal die organic nitrogen is again released back into the soil. 

3. ASSIMMILATION : -
in this process gas from the their roots in their form of amino acids, nitrite ions, nitrate ions.

4. NITRIFICATION : -
in this process ammonia is converted into nitrate by the presence of bacteria in the soil. 

5. DENITRIFICATION : -
In this process the nitrites are reduced back to inert nitrogen gas .





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