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Nitrogen fixing microbes may be free-living or:
ASynoptic
BSymbiotic
CSynthetic
DSystemic
Answer & Solution
Correct answer: B. Symbiotic
1. Azotobacter is an example of the first kind.
2. Rhizobium is an example of the second.
3. The other kind is symbiotic.
_Source: NCERT Class 11 Biology, Ch 12 'Mineral Nutrition'_
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