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Inside a legume nodule, the Rhizobium cells that actually fix nitrogen are called

  • A.Bacteroids
  • B.Heterocysts
  • C.Endospores
  • D.Zoospores

Answer: A

On entering the host cell the bacteria enlarge, change shape and lose the ability to divide, becoming bacteroids devoted to fixation. Heterocysts serve the same purpose in cyanobacteria, while endospores and zoospores are survival and dispersal stages.

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