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Rhizobium fixes atmospheric nitrogen in the root nodules of:

AWheat crop fields
BCotton plantations
CLeguminous plants
DPaddy rice fields
Answer & Solution
Correct answer: C. Leguminous plants
1. It is a symbiotic association. 2. Legume roots carry Rhizobium nodules. 3. Azotobacter fixes nitrogen free-living in soil. _Source: syllabus Biology, Chapter 10, Microbes in Human Welfare._
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