Mineral NutritionMedium
Question
Which of the following is a free living aerobic non-photosynthetic nitrogen-fixer?
Options
A.Rhizobium
B.Azotobacter
C.Azospirillum
D.Nostoc
Solution
Azotobacter is a free living, aerobic non-photosynthetic, ie, saprophytic bacteria. It retains the capability of fixing atmospheric nitrogen, ie, fixation of atmospheric dinitrogen into ammonia.
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