A) Azolla and BGA
B) Nostoc and legumes
C) Rhizobium and Nicotiana
D) Salmonella and E.coli
Correct Answer: A
Solution :
[a] Biofertilizers are organisms which can bring about soil nutrient enrichment. The pair of biofertilizer is Azaliaand BGA (blue-green algae). Azaliais a small, fast growing fem that occurs on floating water and BGA or cyanobacteria are found in sea and fresh water.
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