Consider the following organisms: 1. Agaricus 2. Nostoc 3. Spirogyra Which of the above is/are used as biofertilizer/biofertilizers?
A1 and 2
B2 only
C2 and 3
D3 only
Answer & Solution
Correct answer: B. 2 only
UPSC CSE Prelims 2013 (GS-I, Set A), Q.33. Official answer key: B.
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