Question

What is the importance of nitrogen in the atmosphere?

Answer 1

Hint : Nitrogen is the chemical element with the symbol $N$ and atomic number $7$ . At standard temperature and pressure, two atoms of the element bind to form dinitrogen, a colourless and odourless diatomic gas with the formula ${N_2}$ . Dinitrogen forms about $78\%$ of Earth's atmosphere, making it the most abundant uncombined element.

Complete Step By Step Answer:
Nitrogen is a naturally occurring element that is essential for growth and reproduction in both plants and animals. It is found in amino acids that make up proteins, in nucleic acids, that comprise the hereditary material and life’s blueprint for all cells, and in many other organic and inorganic compounds. Proteins comprise not only structural components such as muscle, tissue and organs, but also enzymes and hormones essential for the functioning of all living things. Urea is a by-product of protein digestion.
Some forms of Nitrogen fixing bacteria are able to bind the Nitrogen gas from the atmosphere and turn the Nitrogen gas into Nitrates ( $NO_3^{ - 1}$ ) and Nitrites ( $NO_2^{ - 1}$ ). These molecules can be further processed then into amino acids necessary for proteins and DNA.

Note :
Farmers can add nitrogen fertilizer to produce better crops, but too much can hurt plants and animals, and pollute our aquatic systems. Without enough nitrogen, plant growth is affected negatively. With too much nitrogen, plants produce excess biomass, or organic matter, such as stalks and leaves. Eutrophication happens when too much nitrogen enriches the water, causing excessive growth of plants and algae.