$A$ farmer has applied chemical fertilisers in his crop field for many successive seasons. In the next season,the crop growth was poor as the soil lost its fertility. Suggest the suitable micro-organisms that replenish the fertility of the soil in his field.
- ASpirulina
- BNostoc
- CChlorella
- DSpirogyra
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Which microorganism is used as a biofertilizer in paddy fields?
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