plz do ans.
Asked by | 16th Feb, 2009, 02:41: PM
Biologically, nitrogen is fixed by nitrogen-fixing bacteria. They may be free-living or associated with some species of dicot plants. Most commonly, the nitrogen-fixing bacteria are found in the roots of legumes in special structures called root nodules.
Answered by | 17th Feb, 2009, 12:31: AM
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