(i) Why do farmers prefer biofertilizers to chemical fertilizers se days? Explain.
(ii) How do Anabaena and mycorrhizae act as biofertilizers?

(i) A farmer relies on biofertilizers than chemical fertilizers because:
(a) Chemical fertilizers significantly increase soil pollution and reduce the quality of soil, as well as water pollution, when it drains into nearby water bodies, after rain.
(b) Overuse of chemical fertilizer makes the soil infertile.

(ii)Anabaena fix atmospheric nitrogen, thus enriching the nitrogen content of the soil, as well as the organic matter.
In mycorrhizae, the fungal symbiont absorbs phosphorus from the soil and passes it to the plant and provides resistance to root-borne diseases, Since, they fulfill the nitrogen and phosphorus requirement they act as biofertilizers.