$A-$ The microbe $Frankia$ produces nitrogen-fixing nodules on the roots of non-leguminous plants.
$R-$ Both $Rhizobium$ and $Frankia$ are free-living in soil,but as symbionts,can fix atmospheric nitrogen.

  • A
    $A$ and $R$ both are correct.
  • B
    $A$ and $R$ both are incorrect.
  • C
    $A$ is correct,$R$ is incorrect.
  • D
    $A$ is incorrect,$R$ is correct.

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