Which one of the following can be used as biofertiliser in cotton field ?

Azolla-Anabaena

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Streptococcus

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Azosphillum

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Azotobacter chroocoocurn

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Solution

The correct option is B Azotobacter chroocoocurn
Cotton is a dicotyledonous crop. The best biofertiliser for cotton is Bacillus cereus and Azotobacter chroococcum. These are free-living $N_{2}$ fixing bacteria and enhance the fertility of the soil.

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Which of the following is used as a biofertiliser?

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