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A nitrogen fixing microbe associated wit...

A nitrogen fixing microbe associated with the fern Azolla in rice fields is

A

Spirulina

B

Anabaena

C

Frankia

D

Tolypothrix

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The correct Answer is:
B
Anabaena azollae is a free-living nitrogen fixing blue-green alga or cyanobacterium but it may also live symbiotically in the leaf cavities of Azolla, an aquatic , This cyanobacterium has nitrogenase enzyme, therefore can fix nitrogen. If this fern is grown in paddy (rice) fields, a remarkable 50% increase in yield can be noticed.
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