Hence, it follows the law of conservation of matter. Filed Under: Class 9, Natural resources Tagged With: ammonification, denitrification, nitrification, nitrogen, nitrogen cycle About Mrs Shilpi Nagpal Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Fixation is the primary step in the process of converting nitrogen, usable by plants. Nitrogen is thus an essential nutrient for all life forms. The sequence in which nitrogen in the atmosphere is passed into the soil and life forms, and then released back into the atmosphere, is called the nitrogen cycle. Nitrogen is a main constituent of the atmosphere encompassing about 75% of the atmospheric gases. Question 1 Explain nitrogen cycle in atmosphere? Nitrogen Cycle Definition “Nitrogen Cycle is a biogeochemical process which transforms the inert nitrogen present in the atmosphere to a more usable form for living organisms.” Furthermore, nitrogen is a key nutrient element for plants. This nitrogen is first converted into ammonia by bacteria (ammonification) and then to nitrites and nitrates by bacteria nitrosomonas and nitrobacter (nitrification). Through assimilation only plants get nitrogen. It is also present in chlorophyll,nucleic acid and […] This is the process by which ammonium converted into nitrates by bacteria. These notes will also be useful for other competitive exams like banking PO, SSC, state civil services exams and so on. Nitrogen cycle The atmospheric nitrogen is fixed by nitrogen fixing bacteria like rhizobium which is present in the root nodules of leguminous plants (nitrogen fixation). Write ten slogans on forest conservation. The nitrogen cycle is the biogeochemical cycle. When animals eat the plants, they obtain usable nitrogen compounds. It forms a part of many molecules like proteins, nucleic acid and some vitamins. In the previous part, of this chapter, you learned about Natural Resources and their types. It is also a vital constituent of different organic compounds such as the vitamins, nucleic acids, pigments, amino acids, and proteins. Normally, bacteria change nitrogen into ammonium. 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