These sets of processes repeat continuously and thus maintain the percentage of nitrogen in the atmosphere. (3) During lightning the high temperature and pressure created in the air converts nitrogen into oxides of nitrogen.These oxides dissolve in water to give nitric and nitrous acid and fall on land along with rain. But, recent researches have proved that the nitrogen from these rocks is released into the plants due to the weathering of rocks. Economics Chapter 1 Development – Notes & Study Material, Geography Chapter 6 Manufacturing Industries – Notes & Study Material. Last Updated on February 5, 2020 By Mrs Shilpi Nagpal 3 Comments. The nitrogen-containing compounds that fall into the ocean as sediments get compressed over long periods and form sedimentary rock. Process of Nitrogen Cycle consists of the following steps – Nitrogen fixation, Nitrification, Assimilation, Ammonification and Denitrification. The decomposers, namely bacteria or fungi present in the soil, convert the organic matter back into ammonium. Nitrogen-fixing bacteria play a crucial role in fixing the atmospheric nitrogen into nitrogen compounds that can be used by the plants. Your email address will not be published. (2) There are certain bacteria which convert this inert nitrogen into nitrates and nitrites which can be taken up and used to make required molecules. Nitrogen Cycle is a biogeochemical process through which nitrogen is converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere. Helps plants to synthesise chlorophyll from the nitrogen compounds. 9.29 are as follows: (1) Some of the free molecular nitrogen of the atmosphere is fixed into nitrates non-bio- logically by lightening when oxygen of the air combines with nitrogen. 2. 9/25/2013 1 2. This nitrogen is made available to plants by symbiotic bacteria which can convert the inert nitrogen into a usable form – such as nitrites and nitrates. Nitrogen is introduced to the soil by fertilizers or animal and plant residues. The process of ammonia formation is called ammonification.Some micro-organism(nitrobacteria, nitrosomonas)convert ammonia into nitrates.The process is called nitrification. Denitrification is the process of converting the nitrate back into molecular nitrogen by bacterias such as Pseudomonas, Thiobacillus, Bacillus subtilis etc. There are certain bacteria which reduce nitrates back to nitrogen or to ammonia or to some other oxides.This process is called denitrification. The entire process of Nitrogen fixation is completed by symbiotic bacteria which are known as Diazotrophs. Later, the nitrogen undergoes a set of changes, in which two nitrogen atoms get separated and combine with hydrogen to form ammonia (NH4+). Also Read: Nitrogen Fixation And Nitrogen Metabolism. These processes take place in several stages and are explained below: It is the initial step of the nitrogen cycle. This conversion is very important as ammonia gas is toxic for plants. Some bacteria then convert these nitrogenous compounds in the soil and turn it into nitrogen gas. Learn Science with Notes and NCERT Solutions Class 6 Class 7 Class 8 Class 9 Class 10. (7) Plants can then assimilate this ammonium ion or still other bacteria can change it to nitrate by nitrification. Thank you. It is found in alkaloids,urea. The plants absorb the usable nitrogen compounds from the soil through their roots. Draw nitrogen cycle for class 9 2 See answers AkshatBudhori2007 AkshatBudhori2007 Answer: Nitrogen is a part of many molecules essential to life like proteins,Nucleic acid(DNA and RNA) and some vitamins. Thank you alot, Your explanation is very interesting and it helps a lot thank you. 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. The nitrogen cycle is the biogeochemical cycle. These bacteria consist of a nitrogenase enzyme which has the capability to combine gaseous nitrogen with hydrogen to form ammonia. However, the abundant nitrogen in the atmosphere cannot be used directly by plants or animals. Nitrogen Cycle 1. Initially, the ammonia is converted to nitrite (NO2−) by the bacteria Nitrosomonas, or Nitrococcus, etc. Sedimentary cycles: These are the biogeochemical cycles in which the reservoir pool is generally lithosphere.