Q.

Free-living nitrogen fixing micro- organisms are -

A. Rhizobia
B. Soil fungi
C. Vesicular arbuscular mycorrhiza
D. Blue green algae
Answer» A. Rhizobia
Explanation: Rhizobia are soil bacteria that fix nitrogen (diazotrophs) after becoming established inside root nodules of legumes. Rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are Gram-negative, motile, non-sporulating rods.
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