Question

What is Nitrogen Cycle?​

Answer 1

Answer:

Nitrogen cycle, circulation of nitrogen in various forms through nature. Nitrogen, a component of proteins and nucleic acids, is essential to life on Earth. Although 78 percent by volume of the atmosphere is nitrogen gas, this abundant reservoir exists in a form unusable by most organisms.

Answer 2

$\large\tt{\textbf{Nitrogen \: Cycle}}$

➼ The process in which the nitrogen of the atmosphere reaches the soil and finally back to the atmosphere is called nitrogen cycle.

• 78 $\large\rm \%$ is present in atmosphere.
• Proteins contain nitrogen. it is also present in RNA, DNA, Vitamins, chlorophyll.
• Nitrogen is taken up by the leguminous plants ( pulses ) directly from the atmosphere and by nitrogen fixing bacteria Rhizobium present in the root nodules of leguminous plants which converts Nitrogen into ammonia. It fixes nitrogen upto $\large\rm 90 \%$ .
• Lightening converts $\large\rm N_2$ into oxides of nitrogen by combining with oxygen at high temperature and pressure.
• Nitrates and nitrites are soluble in water and are readily used by aquatic plants and animals.
• Nitrates and nitrites get converted into nitrogen by denitrification bacteria.

➳ Ammonification: the conversion of dead organic matter into ammonia with help of micro organisms present in the soil is called Ammonification.

➳ Nitrification: it is a process in which ammonia is converted into nitrogen.

➳ Denitrification: it is a process in which nitrites and nitrates are converted into nitrogen which is released in the atmosphere.