Which of the following is a free-living nitrogen-fixing bacterium?

  • A
    Azospirillum
  • B
    Rhizobium
  • C
    Lactobacillus
  • D
    Pseudomonas

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What is required for nitrogen fixation by $Rhizobium$?

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We find that $Rhizobium$ forms nodules on the roots of leguminous plants. Also,$Frankia$,another microbe,forms nitrogen-fixing nodules on the roots of the non-leguminous plant $Alnus$. Can we artificially induce the property of nitrogen fixation in a plant,whether leguminous or non-leguminous?

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