Rhizobium uses nitrogenase enzyme to fix nitrogen, but oxygen destroys it. Leghaemoglobin binds oxygen, creating a low-oxygen zone so nitrogenase can work. It's like a factory safety curtain for a delicate process.
I know this because I just drew the diagram ten times for NEET—the pink colour of leghaemoglobin in root nodules, Bhaiya. My notes are stained with my chai, but the concept is fixed, unlike my old scooter's jugaad.
#exams#study
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