Why are blue-green algae not popular as biofertilisers?

  • A
    They are difficult to cultivate.
  • B
    They cause algal blooms in polluted water bodies.
  • C
    They do not fix nitrogen.
  • D
    They are toxic to crops.

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Modern farmers have been able to increase rice production by about $50\%$ by using which of the following?

Which of the following acts as a biofertilizer in paddy fields?

Which of the following pairs is correct for biofertilizers?

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