Question

explain the main steps showing how the nitrogen remains constant in atmosphere​

Answer 1

Ans:The percentage of nitrogen in atmosphere is kept constant through nitrogen cycle. The sequence in which nitrogen in the atmosphere is passed into the soil and life forms, and then released back into the atmosphere, is called the nitrogen cycle. a) Nitrogen fixation: The process of conversion of atmospheric nitrogen into nitrogenous compounds and making it available for plants is called as nitrogen fixation. Nitrogen fixation can happen by biological processes or physical processes. Nitrogen is introduced to the soil by fertilisers or animal and plant residues. b) Ammonification: The process of production of ammonia from organic compounds is called ammonification. Ammonification is the process carried out by a variety of microorganisms that breakdown protein, amino acids, and other nitrogen-containing compounds of dead and waste organic matter to form ammonia. c) Nitrification: It is the process by which ammonia is converted to nitrites (NO2-) and then to nitrates (NO3-). This process naturally occurs in the environment, where it is carried out by specialised bacteria. Nitrosomonas and nitrobacter are the bacteria which bring about nitrification. d) Denitrification: It is the biological conversion of nitrate to nitrogen gas, nitric oxide or nitrous oxide. These compounds are gaseous compounds and are not readily available for microbial growth. Therefore, they are typically released into atmosphere. This process is brought about by denitrifying bacteria.

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Answer 2

Answer:

Nitrogen is maintained in atmosphere by nitrogen cycle.

Explanation:

1. Nitrogen in atmosphere is taken by roots of leguminous plant by bacteria such as Rhizobium.
2. Nitrogen which is taken up by plants grows and dead after them the animal eats the plant.
3. When the animal had eaten up the plant then nitrogen transferred into animals body which in turn animals get die.
4. Instead of plants and animal takes up the nitrogen , the nitrogen can be directly fixed by the process of lightning.
5. The bacteria present in the soil decomposes the dead bodies and again send back the nitrogen to the atmosphere.

• Thus the amount of nitrogen present in the atmosphere maintains and the cycle goes on continuous .
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