The enzyme nitrogenase functions under $............$ conditions.

What is required for nitrogen fixation by $Rhizobium$?

$Nif$ genes occur in

During biological nitrogen fixation,which substance protects the enzyme nitrogenase from the harmful effects of oxygen?

How many of the following organisms are capable of nitrogen fixation?
Azospirillum, Glomus, Nostoc, Monascus purpureus, Yeast, Anabaena, Oscillatoria, Azotobacter, Trichoderma

$Rhodospirillum$ is an anaerobic free-living bacterium.