Consider the following organisms:
Which of the above is/are used as biofertilizer/biofertilizers?
[UPSC Civil Services Exam – 2013 Prelims]
(a) 1 and 2
(b) 2 only
(c) 2 and 3
(d) 3 only
- Option 2 is the correct answer because Nostoc, a type of free-living bacteria, has the ability to fix atmospheric nitrogen into a form that is beneficial for plant growth.
- This makes it a potential sustainable biofertilizer, unlike Spirogyra which is not commonly used for this purpose and can even compete with plants if introduced into the soil.
- Agaricus, on the other hand, is a mushroom species that is known for its edible varieties.