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Which two bacteria fix atmospheric nitrogen while free-living in soil?
ARhizobium and Frankia
BAzospirillum and Azotobacter
CLactobacillus and Bacillus
DGlomus and Trichoderma
Answer & Solution
Correct answer: B. Azospirillum and Azotobacter
Azospirillum and Azotobacter fix nitrogen without a host, enriching soil nitrogen.
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