Some blue-green algae can be used as biofertilizers because they are:

  • A
    Photosynthetic
  • B
    Surrounded by mucilage
  • C
    Growing everywhere
  • D
    Capable of fixing nitrogen

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Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer?

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What is the primary function of biofertilizers?

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