A. Biofertilizers are organisms that enrich the nutrient quality of the soil
B. Realising the problems associated with the overuse of chemical fertilisers, there is a large pressure to switch to organic farming-the use of biofertilisers
C. The main sources of biofertilisers are bacteria, fungi, protozoans and cyanobacteria
D. In the root nodules of leguminous plants, symbiotic association is formed by Rhizobium
Solution & Explanation
No details explanation available for this question. Option C is the verified correct answer.