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A nitrogen-fixing microbe associated with Azolla in rice fields is:

  1. A
    Tolypothrix
  2. B
    Spirulina
  3. C
    Anabaena
  4. D
    Frankia

Solution & Step-by-step Explanation

Anabaena azollae is a cyanobacterium that lives in a symbiotic relationship with the cavities of the leaves of the water fern Azolla. It fixes atmospheric nitrogen, which makes this association a powerful biofertilizer in rice paddies.

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A nitrogen-fixing microbe associated with Azolla in rice fields is:
A
Tolypothrix
B
Spirulina
C
Anabaena
D
Frankia

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