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Question

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

A
Frankia
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B
Rhizobium
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C
Spirulina
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D
Anabaena
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Solution

The correct option is D Anabaena
Anabaena azollae, a cyanobacterium that lives in symbiotic association with the free-floating water fern Azolla. Anabaena azollae can grow Photo-autotrophically and fixes atmospheric nitrogen. The inoculation of cyanobacteria in rice crops significantly influences the growth of rice crop by secretion of ammonia in floodwater.

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