Which nitrogen-fixing microorganism is associated with Azolla in paddy fields?

  • A
    Spirulina
  • B
    Anabaena
  • C
    Frankia
  • D
    Tolypothrix

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Which free-living nitrogen-fixing cyanobacterium shows a symbiotic relationship with the water fern Azolla?

The common nitrogen-fixer in paddy fields is

Which of the following is a biofertilizer?

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