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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 | |
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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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