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Which genus forms nitrogen-fixing root nodules on leguminous plants?

  • A.Clostridium
  • B.Rhizobium
  • C.Azotobacter
  • D.Nitrobacter

Answer: B

Rhizobium infects legume roots and induces nodules in which it fixes nitrogen for the host in exchange for carbon. Azotobacter and Clostridium fix nitrogen too, but they live free in the soil and form no nodules, and Nitrobacter oxidises nitrite rather than fixing anything.

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