Question

what is nitrogen cycle class 9 ​

Answer 1

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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,[1]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.

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Answer 2

Nitrogen plays a vital role in the survival of all living organisms. It is one of the primary nutrients and component of biomolecules such as chlorophyll, DNA, and proteins. Nitrogen is the most abundant element present in the atmosphere. Even though it is widely available, it acts as a scarce resource. Only when used in ammonia, it can be used by primary producers such as plants.

The simple diagram of the nitrogen cycle is as shown below.

Nitrogen Cycle

Nitrogen gas (N2) exists in both organic and inorganic forms. Therefore it undergoes various types of transformation in order to maintain a balance in the ecosystem. The important transformations that nitrogen supports are nitrogen fixation, assimilation, ammonification, nitrification, and denitrification process. The conversion of this gas into its oxidation states plays an important role in maintaining the ecological balance.