Which of the following pair represents free living nitrogen fixing...

Which of the following pair represents free living nitrogen fixing aerobic bacteria?

Options

ARhizobium and Frankia
BAzotobacter and Beijerinckia
CAnabaena and Rhodospirillum
DPseudomonas and Thiobacillus

Correct answer

B. Azotobacter and Beijerinckia

Step-by-step solution

Azotobacter and Beijerinckia are free living,

\mathrm{N}_2

fixing, Aerobic bacteria. Rhizobium and Frankia are associated bacteria. Pseudomonas and Thiobacillus are denitrifying bacteria while Rhodospirillum is anaerobic non,

\mathrm{N}_2

Fixing bacteria.

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