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Which of the following is used as Biofertilizer?
1. Rhizobium
2. Blue-green algae
3. Azolle
4. All of these

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Correct Answer - Option 4 : All of these

The correct answer is All of these.

  • Rhizobium, Blue-green algae and Azolle is used as Biofertilizer.
    • Biofertilizers include Rhizobium, Azotobacter, Azospirillum, and blue-green algae (BGA).
    • Rhizobium inoculant is used in leguminous crops.
    • Azotobacter can be used with crops like wheat, maize, mustard, cotton, potato, and other vegetable crops.
    • A biofertilizer made from this organism is applied either by coating seeds with the fungus (called inoculation) or putting it directly into the ground where the plant's roots will live.
  • Hence, option 4 is correct.

  •  Azolle :
    • Azoles are a class of five-membered heterocyclic compounds containing a nitrogen atom and at least one other non-carbon atom as part of the ring.
    • The parent compounds are aromatic and have two double bonds, there are successively reduced analogues with fewer.
  • Blue-green algae :
    • Blue-green algae are actually types of bacteria known as Cyanobacteria.
    • They normally look green and sometimes may turn bluish when scums are dying.
    • Taste and odour problems commonly occur with large concentrations of blue-green algae and some species are capable of producing toxins.
  • Rhizobium :
    • Rhizobium is a genus of bacteria associated with the formation of root nodules on plants.
    • These bacteria live in symbiosis with legumes.
    • They take in nitrogen from the atmosphere and pass it on to the plant, allowing it to grow in soil low in nitrogen.

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