Consider the following:

  1. Rhizobium
  2. Azotobacter
  3. Blue Green Algae

 Which of the above are used as bio fertilizers?

Answer: [D] 1, 2 & 3

Bio fertilizers are substances, which contain microorganisms, which when added to plants add nutrients through natural process of nitrogen fixation and solubilising phosphorus thus stimulating plant growth. Some important bio fertilizers are: Rhizobium, Azotobacter, Azospirilium and blue green algae (BGA).

This question is a part of GKToday's Integrated IAS General Studies Module