Nodules bacteria rhizobium fixes nitrogen only in presence of leghaemoglobin
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Rhizobium bacteria free living state main rahta jab N2 fixation nhi hota tab and aerobic also but jaise hi symbiotic association karta hai uska nature aerobic ho jata hai and o2 ki presence main N2 fix nhi ho pata issliye leghb o2 scavenger hota hai jo O2 consume kar leta hai
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