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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: syllabus Biology, Ch 12 'Mineral Nutrition'_

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