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

  • [AIPMT 1993]
  • [AIPMT 1998]
  • [AIPMT 1999]
  • A

    Mycorrhiza

  • B

    Azolla pinnata

  • C

    Cyanobacteria

  • D

    Legume-Rhizobium symbiosis

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  • [AIPMT 2011]

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  • [AIPMT 1999]

Which bacteria fix atmospheric nitrogen whilethey are free - living in the soil ?

The common nitrogen­fixer in paddy fields is

  • [AIPMT 2010]

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