Biofertilizers include:

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil.$1$. Nitrogen-fixing bacteria (e.g.,$Rhizobium$,$Azospirillum$) fix atmo

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All of these

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(D) Biofertilizers are organisms that enrich the nutrient quality of the soil.$1$. Nitrogen-fixing bacteria (e.g.,$Rhizobium$,$Azospirillum$) fix atmospheric nitrogen into the soil.$2$. Nitrogen-fixing cyanobacteria (e.g.,$Anabaena$,$Nostoc$) also add nitrogen to the soil,especially in paddy fields.$3$. Mycorrhiza (fungal association with roots of higher plants) helps in the absorption of phosphorus from the soil.Therefore,all the listed options are examples of biofertilizers.

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