The main sources of biofertilisers are:(a) Ba | vedclass

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(A) Biofertilisers are organisms that enrich the nutrient quality of the soil.$(a)$ Bacteria: Many bacteria like $Rhizobium$ (symbiotic) and $Azospiri

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$(a), (b), (c)$

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(A) Biofertilisers are organisms that enrich the nutrient quality of the soil.$(a)$ Bacteria: Many bacteria like $Rhizobium$ (symbiotic) and $Azospirillum$ (free-living) fix atmospheric nitrogen.$(b)$ Cyanobacteria: These are autotrophic microbes widely distributed in aquatic and terrestrial environments,many of which can fix atmospheric nitrogen,$e.g.$,$Nostoc$,$Anabaena$,and $Oscillatoria$.$(c)$ Fungi: Many members of the genus $Glomus$ form symbiotic associations with plants known as mycorrhiza. The fungal symbiont in these associations absorbs phosphorus from the soil and passes it to the plant.$(d)$ Protists: Protists are not typically used as biofertilisers.Therefore,the main sources of biofertilisers are bacteria,cyanobacteria,and fungi. The correct option is $(a), (b), (c)$.

The main sources of biofertilisers are:
$(a)$ Bacteria
$(b)$ Cyanobacteria
$(c)$ Fungi
$(d)$ Protists

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The main sources of biofertilisers are:$(a)$ Bacteria$(b)$ Cyanobacteria$(c)$ Fungi$(d)$ Protists