Which of the following pair is of biofertilizers

Options :
  1. Azolla and blue green algae
  2. Nostoc and legumes
  3. Rhizobium and grasses
  4. Salmonella and E. coli
Answer and Explanation :-

Answer: Option 1


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When one tugs at a single thing in nature, he finds it attached to the rest of the world.
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