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Some plants have nitrogen-fixing bacteria in their root nodules. What are these bacteria called?

  • A.Blue green algae
  • B.Nitrosomonas
  • C.Azotobacter
  • D.Rhizobium

Answer: D

Correct answer: Rhizobium

Rhizobium is the nodule-forming symbiont of legumes. Azotobacter fixes nitrogen too, but free-living in the soil rather than in nodules; Nitrosomonas oxidises ammonia rather than fixing nitrogen.

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