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Q. Which of the below is / are used as Biofertilizer(s)?
  1. Agaricus
  2. Nostoc
  3. Spirogyra
  4. Azospirillum
Select the correct option from the codes given below:
Answer: 2 and 4 only
Notes: Nostoc and Azospirillium are the organisms that are used as bio fertilizers. Nostoc is a blue green algae while Azospirillium is aerobic free-living nitrogen fixers which live in associative symbiosis.

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Question Number: 56 in 6. Agriculture, Irrigation, Seeds, Fertilizers and other Inputs in above course in App.