How do blue-green algae increase the fertility of the soil?

  • A
    By fixing carbon dioxide
  • B
    By adding oxygen
  • C
    By adding organic matter
  • D
    By adding inorganic matter

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Which of the following microorganisms lives in symbiosis with plants and helps in their nutrition?

Which of the following is a free-living biofertilizer?

Azolla is used as a biofertilizer because it contains:

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