BotanyWhich of the following is free living aerobic, non-photosynthetic nitrogen fixing bacterium?

Which of the following is free living aerobic, non-photosynthetic nitrogen fixing bacterium?

  1. A

    Nostoc

  2. B

    Rhodospirillum

  3. C

    Rhizobium

  4. D

    Azotobacter

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    Solution:

    Azotobacter is free living aerobic nitrogen fixer. 

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