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23/08/2021 9:00 pm
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Which of the following is a free-living aerobic nonphotosynthetic nitrogen-fixer?
(1) Azospirillum
(2) Rhizobium
(3) Nostoc
(4) Azotobacter
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23/08/2021 9:02 pm
Correct answer: (4) Azotobacter