Question
Name the micro-organisms which help in biological fixation of nitrogen. How?
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Answer
Two different types of micro-organisms can bring about biological nitrogen fixation.
- Root-nodules of leguminous plants contain the micro-organism rhizobium. These micro-organisms absorb atmospheric nitrogen and convert if into its nitrate, a compound.
- Micro-organisms like azotobacter are’present in soil. They also convert atmospheric nitrogen into nitrates.
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