Question

what is nitrogen cycle??​

Answer 1

Answer:

the plants which requires nitrogen in large quantities

their life cycle is called nitrogen cycle

Answer 2

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$\implies$The nitrogen cycle is the biogeochemical cycle that describes the transformation of Nitrogen and nitrogen- containing compounds in nature

The steps involved in the the conversion of atmospheric nitrogen into nitrates and back to atmospheric nitrogen are:—

➺Nitrogen Fixation:— It is the process by which nitrogen gas in the atmosphere is converted into compounds of Nitrogen. It takes place in three ways:—

• Biological Nitrogen Fixation:— It is the conversion of atmospheric nitrogen into compounds of Nitrogen by the action of certain living organisms, like rhizobium bacteria which reside in the root nodules of leguminous plants.
• Atmospheric Nitrogen Fixation:— During lightning, atmospheric nitrogen combines with oxygen to form nitrogen oxide. These oxides react with rainwater and are carried to the earth in the form of nitrous or nitric acid this is called Atmospheric Nitrogen Fixation. Minerals in the soil can convert nitric acid to soluble nitrates which can be used by plants.
• Industrial Fixation:— Fertilizers consisting of nitrogen in the form of ammonia or urea or Ammonium Nitrate are produce to be added to soil. this is known as Industrial Fixation of nitrogen.

➺Assimilation:— Nitrates are absorbed by the plants and converted into biological molecules, like amino acid, nucleic acid, etc. Animals, fungi, and other heterotrophic organisms observe nitrogen through the food chain.

➺Ammonification:— When plants or animals die or animals excrete, organic nitrogen trapped in their bodies or waste is converted into ammonia by soil bacteria. This process is called a ammonification or mineralization.

➺Nitrification:— Conversion of ammonia first into nitrites and then into nitrates by the action of refined bacteria present in the soil is called nitrification.

➺Dentrification:— It is the conversion of nitrites back into the largely inert Nitrogen gas (N2) completing the nitrogen cycle. This is process is performed by bacteria in anaerobic conditions.

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