Q83.
Consider the following organisms: 1. Agaricus 2. Nostoc 3. Spirogyra Which of the above is/are used as biofertilizer/biofertilizers?
Answer
B
Explanation
Agaricus is a genus of mushrooms — it is not a biofertilizer. Nostoc is a cyanobacterium that fixes atmospheric nitrogen and is used as a biofertilizer (symbiotic nitrogen-fixer). Spirogyra is a filamentous green alga of the order Zygnematales — it is not a biofertilizer.