Azolla is used as a biofertiliser because it

  • A
    Has association of mycorrhiza
  • B
    Multiplies at faster rate to produce massive biomass
  • C
    Has association of nitrogen-fixing Rhizobium
  • D
    Has association of nitrogen-fixing cyanobacteria

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$A$ nitrogen-fixing microbe associated with $Azolla$ in rice fields is

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