Question

How are biofertilizers more beneficial aa compared to chemical fertilizers

Answer 1

Bio fertilizers, u can also say manure is more beneficial than fertilizers because 
1 manures enhances the water holding capacity of soil.
2 it increases the number of friendly microbes in soil.
3 it adds humus to the soil.
4 it is cheap compared to the fertilizers.
5 it does not cause water pollution.
                                       WHEREAS 
excessive use of fertilizers greatly increases crop growth but sometimes the yield get effected moreover when fertilizers get washed off through irrigation and rainfall, they reach water bodies like lake pond river which cause water pollution and kills many aquatic animals

Answer 2

they are more beneficial because they are naturally created while chemical fertilizers not only damage plants but also soil and are harmful when eaten through our food
natural fertilizer are not harmful to environment.