The main source of biofertilizers is:

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(C) Biofertilizers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilizers include bacteria,cyanobacteria,and f

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Certain bacteria,cyanobacteria,and fungi

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(C) Biofertilizers are organisms that enrich the nutrient quality of the soil. The main sources of biofertilizers include bacteria,cyanobacteria,and fungi. $1$. Bacteria: Examples include $Rhizobium$ (symbiotic) and $Azospirillum$ (free-living). $2$. Cyanobacteria: Examples include $Anabaena$,$Nostoc$,and $Oscillatoria$,which fix atmospheric nitrogen. $3$. Fungi: $Mycorrhiza$ is a symbiotic association between fungi (e.g.,$Glomus$) and roots of higher plants,which helps in phosphorus absorption. Therefore,the correct answer is $C$.

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