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Crop yield improvement - class-VIII
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A nitrogen fixing microbe associated with the fern Azolla in rice fields is:
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A
Anabaena
💡 Explanation:
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.