Question

explain the nitrogen cycle​

Answer 1

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,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. Human modification of global nitrogen cycle can negatively affect the natural environment system and also human health.

Answer 2

Answer:

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nitrogen is an essential components of all living organisms, such as proteins, nucleic acid and chlorophyll and vitamins although the percentage of nitrogen in atmosphere is more, it cannot be utilised directly by plants or animal.

the steps involved in nitrogen cycle are written below :-

• nitrogen fixation:- the atmospheric nitrogen is fixed into nitrogen compounds such as nitrates by lightning and by biological nitrogen fixation through nitrogen fixing bacteria.
• the plant absorb nitrate compounds from the soil and convert them into plant proteins. As plant a eaten by animals , plant proteins are used to make animal protein.
• ammonification is the process in which when plants and animals die, there remains are converted into Ammonia and ammonium compounds. Bacteria and fungi decomposers Complex protein into Ammonia. This process is called ammonification.
• nitrification is the process in which the ammonia has formed is converted into nitrates and nitrites by the action of some bacteria. This process is called nitrification.
• denitrification is a process in which certain denitrifying bacteria convert nitrate form of Nitrogen into gaseous form which was back into the atmosphere. This is called you nitrification