Which of the following is used as a biofertilizer in paddy fields?

  • A
    Azotobacter
  • B
    Bacillus bacteria
  • C
    Cyanobacteria
  • D
    Blue-green algae

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Which of the following microorganisms forms a symbiotic association with plants and helps in their nutrition?

Which nitrogen-fixing cyanobacterium also exhibits a symbiotic relationship with Azolla?

Which one is a green manure or biofertilizer?

Which substance of biological origin is used to maintain and increase soil fertility?

Which of the following organisms add organic matter to the soil and increase its fertility?

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