Which of the following groups of plants are highly useful in increasing soil fertility

  • [AIPMT 1993]
  • A

    Red algae

  • B

    Fungi

  • C

    Bacteria

  • D

    Bryophytes

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Which of the following is free living aerobic and nonphotosynthetic nitrogen fixing bacterium

  • [AIPMT 1997]

Definitions / Explanation : Biofertiliser

The biofertilizer present in the roots of legumes is

Azolla is used as biofertilizer as it has

Yield of paddy field can be increased by application of

  • [AIPMT 1999]