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Question
Explain, briefly the role of bacteria in nitrogen fixation.
Solution
Bacteria plays an important role in nitrogen fixation. There are two types of nitrogen-fixing bacteria.
1. Symbiotic bacteria: Rhizobium is a symbiotic bacteria living in root nodules of a leguminous plant which directly fix atmospheric nitrogen and convert them into nitrites and nitrates and make them available to the plant.
2. Free-living bacteria: Bacteria like Azatobacter and Clostridium live inside the soil and fix free nitrogen of the air and convert them into ammonia, amino- acids and proteins.
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