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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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