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Chapter 2 part 7 - Nitrogen fixation and Dentrification
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Nitrogen fixation and dentrification

Aartee Mishra is teaching live on Unacademy Plus

Aartee Mishra
Delhi University Topper Post Graduation in History YouTube & Telegram Channel - Rank secure. Successfully Taught 40 GS Batches/ Motivator

Unacademy user
Mam I am a big fan of yours , but it is very confusing to understand nitrogen cycle from here , and it is de-ni-trification and not dentrification . Ur efforts are really appreciable , thank u so much for this wonderful job . Requesting you to complete this book asap . Good Luck !
mam mujhe shankar ias ki book nhi mili becoz I live in village bt I hope aapke esh course se mujhe help mile ....
mam your free classes are very help full to the students who are financially poor...and you are giving full support to that students also also one of the financially poor student..when i follow your free courses im getting confidence...i will clear upsc......heart fully thank you so much mam to giving excellent free courses....and please continue these free classes mam...
you have made this chapter very complex. the nitrogen cycle is rather a simple process but this time you have really made it confusing who watches this video. I am a fan of yours anyway.
  1. Environment Book Summary Presented B Aartee Mishra


  3. NITROGEN CYCLE A BIOGEOCHEMICAL CYCLE 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. . NH, NITROGEN FIXING BACTERIA DENITRIFICATION BACTERIA NO NH NO NITRIFICATION NITRIFYING BACTERIA

  4. Nitrogen in atmosphere Anthropogenic emission (NOT 1. Deposition 1 8 IFertilizers, crop and livestock 7. production Nitrogen organic matter in soil I 2. 2. 5. 4. Nitrite 4 Ammonium Nitrate (NO,) sol and water(NO21 soil and water (NH4) sall and water

  5. Here are the different types of processes combined with the nitrogen cycle Nitrogen fixation Atmospheric nitrogen is converted into the usable form by lightning strikes or symbiotic bacteria which are known as Diazotrophs. These bacteria consist of a nitrogenase enzyme which has the capability to combine gaseous nitrogen with hydrogen to form ammonia. Ammonification When plants or animal die organic nitrogen is again released back into the soil. Bacteria or fungi present in the soil convert them back into ammonium. This process is also called as mineralization. . Assimilation Primary producers take in this gas from the soil with the help of their roots in the form of amino acids, nitrite ions, nitrate ions or ammonium ions. This way it enters the food cycle when the consumers eat the plants

  6. N2 Dentrification Nitrogen fixation Ammonification Nitrogen fixing Bacterla NH4 Assimilation Denltrification bacterla NO2 NH3 NO3 Nitrifying bacteria

  7. Nitrification .In this process, the ammonia is converted into nitrate by the presence of bacteria in the soil. Nitrites are formed by the oxidation of Ammonia with the help of Nitrosomonas bacterium species. Later, the produced nitrites are converted into nitrates by Nitrobacter. This conversion is very important as ammonia gas is toxic for plants. Denitrification In order to complete the nitrogen cycle, the nitrites are reduced back to inert nitrogen gas in this process. This is done by bacterial species such as Clostridium and Pseudomonas in the absence of oxygen.