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A nitrogen-fixing microbe associated with Azolla in rice fields is
A
Tolypothrix
B
Spirulina
C
Anabaena
D
Frankia
Detailed Solution
The water fern Azolla harbours the cyanobacterium Anabaena azollae in its leaf cavities.
Anabaena fixes atmospheric nitrogen, so Azolla is used as a biofertiliser in paddy fields.
Frankia forms nodules on the roots of non-leguminous plants such as Alnus.
Anabaena fixes atmospheric nitrogen, so Azolla is used as a biofertiliser in paddy fields.
Frankia forms nodules on the roots of non-leguminous plants such as Alnus.