Nitrogen cycle
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A-level OCR A biology
Last updated 12:41 PM on 4/12/26
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7 Terms
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Rhizobium
nitrogen fixing bacteria that convert nitrogen to ammonium ions in root nodules
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Azotobacter
Fix nitrogen gas to ammonium ions
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Lightning
converts nitrogen gas to nitrates
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Denitrifying bacteria
Convert nitrates to nitrogen gas in anaerobic conditions
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Nitrosomonas
Converts ammonium ions to nitrites
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Nitrobacter
converts nitrites to nitrates
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Saprotrophic bacteria
Converts nitrogen compounds in dead organisms to ammonia and ammonium ions