Consider the following organisms :
- 1. Agaricus
- 2. Nostoc
- 3. Spirogyra
Which of the above is/are used as biofertilizer/biofertilizers?
[amp_mcq option1=”1 and 2″ option2=”2 only” option3=”2 and 3″ option4=”3 only” correct=”option2″]
This question was previously asked in
UPSC IAS – 2013
2. Nostoc is a genus of cyanobacteria (blue-green algae) known for its ability to fix atmospheric nitrogen. It is widely used as a biofertilizer, especially in paddy fields.
3. Spirogyra is a genus of filamentous green algae. It is photosynthetic but does not fix nitrogen and is not used as a biofertilizer.