Question

Nitrogen fixation is the process of:
A. Conversion of atmospheric nitrogen into usable form
B. Conversion of ammonia into atmospheric nitrogen
C. Conversion of nitrate into atmospheric nitrogen
D. Conversion of atmospheric nitrogen into urea

Answer 1

The nitrogen cycle is a biogeochemical process that converts inert nitrogen in the atmosphere into a form that can be used by living organisms.” In addition, nitrogen is an important nutrient for plants. Plants and animals, on the other hand, cannot directly use the copious nitrogen in the atmosphere. Continue reading to learn how the nitrogen cycle provides usable nitrogen to plants and other living beings.

Complete answer:
The nitrogen cycle is a biogeochemical process in which nitrogen is transformed into a variety of forms before returning to the atmosphere via the soil and organism.
Nitrogen fixation, nitrification, denitrification, degradation, and putrefaction are some of the processes involved.
Organic and inorganic forms of nitrogen gas occur. Organic nitrogen is found in living species and is transferred down the food chain through other living organisms' intake.
Nitrogen undergoes a variety of transformations in order to preserve ecosystem balance. This process also affects a variety of biomes, with the marine nitrogen cycle being one of the most complex biogeochemical cycles.
Hence the correct answer is (A) Conversion of atmospheric nitrogen into usable form.
Nitrogen Cycle Stages: Nitrogen fixation, nitrification, assimilation, ammonification, and denitrification are the steps in the nitrogen cycle process. These processes are broken down into steps, which are described below:

Fixation of nitrogen: It is the initial phase of the nitrogen cycle. Atmospheric nitrogen (N2), which is predominantly available in an inert form, is transformed to the useful form -ammonia- in this process (NH3). The inert form of nitrogen gas is deposited into soils from the atmosphere and surface waters during the nitrogen fixation process, primarily by precipitation. Later, the nitrogen undergoes a series of modifications that result in the separation of two nitrogen atoms, which mix with hydrogen to produce ammonia (NH4+).

The entire nitrogen fixation process is finished by symbiotic bacteria known as Diazotrophs. Azotobacter and Rhizobium are other important players in this process. The nitrogenase enzyme in these bacteria is capable of combining gaseous nitrogen with hydrogen to produce ammonia.

Note:-
Nitrogen fixation can take place in two ways: through atmospheric fixation, which includes lightening, or through industrial fixation, which requires the production of ammonia at high temperatures and pressures. Man-made operations, especially industrial ones that produce ammonia and nitrogen-rich fertilisers, can also help.