A nitrogen­fixing microbe associated withAzolla in rice fields is

  • [AIPMT 2012]
  • A

    Spirulina

  • B

    Anabaena

  • C

    Frankia

  • D

    Tolypothrix.

Similar Questions

Which of the following is non-symbiotic biofertilizer

  • [AIPMT 1998]

Biofertilizers include

  • [AIPMT 2001]

Azolla enriches rice fields with nitrogen due to its association with

Crop rotation is carried out for

What are biofertilizers ? Give two examples.