Most active nitrogen fixing blue-green algae of rice fields is

Anabaena azollae

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Aulosira fertilissima

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Cylindrospermum licheniforme

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Nostoc cycadacearum

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Solution

The correct option is B
Aulosira fertilissima

Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen. In paddy fields, cyanobacteria serve as an important biofertilizer.
Aulosira fertilissima is the most active non-symbiotic nitrogen fixer in rice field in India. Hence, Option B is correct.

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