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.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 56 in 6. Agriculture, Irrigation, Seeds, Fertilizers and other Inputs in above course in App.