Which of the following is pair of bio-fertilizers?
(a) Azolla and BGA
(b) Nostoc and legumes
(c) Rhizobium and grasses
(d) Salmonella and E. coli
Correct option: (a) Azolla and BGA
Explanation:
Azolla and Blue green algae- Anabaena form biofertilizer in rice fields.
