Nitrogen fixing converts N 2 from the air into nitrates. Filed Under: Class 8, Micro-organism:Friend and Foe Tagged With: nitrogen fixation, nitrogen-fixing bacteria, Rhizobium bacteria 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. NCERT Solutions for Class 8 Science Chapter 2 – 5 Mark Questions and Answers. Describe the nitrogen cycle with the help of a neat and labelled diagram. Write 10 lines on the usefulness of microorganisms in our lives. [MSE (Chandigarh) 2005, 2007] Answer: Question 2. ; In reverse, denitrification converts nitrates back to N 2 as a gas. This video is highly rated by Class 7 students and has been viewed 4967 times. Question 1. Nov 21, 2020 - The Nitrogen Cycle Class 7 Video | EduRev is made by best teachers of Class 7. ; Finally, nitrification converts ammonia into nitrates. Nitrogen Cycle Definition: The nitrogen cycle can be defined as one of the biogeochemical cycles that converts the unusable inert nitrogen existing in the atmosphere into a more usable form of nitrogen for living organisms. The nitrogen cycle consists of 4 major steps. What is the Nitrogen cycle? e.g-symbiotic bacteria : Rhizobium symbiotic blue-green algae : species of Nostoc, Anabaena , etc free-living bacteria : Azotobacter, Clostridium, Derxia, Rhodospirillium, etc 9/25/2013 8 Nitrogen Cycle a) Biological Nitrogen fixation : some symbiotic bacteria , blue-green algae and some free-living bacteria are able to fix nitrogen as organic nitrogen.

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