Root nodules for nitrogen fixation of a non-leguminous tree possess
Frankia
Rhizobium
Azotobacter
Thiobacillus
Symbiotic nitrogen fixation in root nodules of some legumes is caused by
The main sources of biofertilisers are
$(a)$ Bacteria
$(b)$ Cyanobacteria
$(c)$ Fungi
$(d)$ Protists
How do microbes reduce the environmental degradation caused by chemicals ?
Definitions / Explanation : Mycorrhiza
Why are blue green algae not popular as biofertilisers ?