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UPSC Civil Services 2013 Prelims General Studies Paper I

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Question : 8

Total: 100

Consider the following organisms:
1. Agaricus
2. Nostoc
3. Spirogyra
Which of the above is/are used as biofertilizer / biofertilizers?

1 and 2
2 only
2 and 3
3 only

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