Question

What is Nitrogen cycle?

Answer 1

The nitrogen cycle involves nitrogen fixation, nitrification, and denitrification.It is a cycle within the biosphere which involves atmosphere, hydrosphere, and lithosphere. hope this will help

Answer 2

NITROGEN CYCLE :


Air contains about 78 % nitrogen in atmosphere. Water bodies also contains nitrogen. nitrogen is an essential component of proteins , vitamins and nucleic acids which are present in all living things.


The cyclic process by which nitrogen element is circulated continuously through the living and non- living components of the biosphere is called Nitrogen Cycle.


Nitrogen Cycle has the following steps :

♣ Nitrogen Fixation

♣ Nitrogen Assimilation

♣ Dentrification


♠ Nitrogen Fixation :-

It is of three types :

1. Atmospheric Nitrogen Fixation :

During lightining in the sky when temperature is high, the nitrogen gas present in the atmosphere reacts with oxygen to produce oxides of nitrogen which gets dissolved in rainwater forming dilute nitric acid. This reacts with alkalies of the soil to form nitrates.

2. Biological Nitrogen Fixation :

Atmospheric Nitrogen is converted into nitrogen Compound by living organisms. Nitrogen fixing bacteria like rhizobium and clostridium , which lives in the foot nodules of leguminous plants convert atmospheric nitrogen into nitrates.


♠ Nitrogen Assimilation :-

Inorganic nitrogenous compounds are converted into organic Compounds that become a part of living organisms. The conversion of inorganic compounds into organic Compounds is called Nitrogen Assimilation. The plant absorb nitrogenous compound from the soil and water and convert them into plant proteins.


♠ Dentrification :-

The conversion of nitrate salt which is present in the soil to free nitrogen gas is called Dentrification. It is carried out in the soil by bacteria called pseudomonas.


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#akashmandal.