Question

what is nitrogen cycle?​

Answer 1

Nitrogen cycle is the process by which nitrogen is converted into its various chemical forms and becomes available to living organisms. The nitrogen compounds like protein, nucleic acids are required to all living organisms. Most organisms cannot intake nitrogen in a form it is present in nature.

The processes that participate in this cycle to change the form of nitrogen are

Nitrogen fixation – During lightening or action of some microbes the inert nitrogen breaks down and combines with oxygen in air to form nitrous oxide. This process is called nitrogen fixation.

Nitrification: Some nitrifying bacteria are present in the soil which absorb the atmospheric nitrogen and make it available for the plants to uptake. This is called nitrification.

Decay: By the process of decaying as an action of decomposing microbes, the proteins (compound of nitrogen) present in decaying plant or animal bodies return to the environment.

Denitrification: Some bacteria are present inside the deep layer of soil that break down the nitrate and release nitrogen to the atmosphere. They are denitrifying microorganisms. They release back the nitrogen absorbed by the above processes and end the nitrogen cycle.

Answer 2

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here's your answer

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is atmosphere nitrogen,[20] making it the largest source of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems.

The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle .