Consider the following organisms : 1. Agaricus 2. Nost

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Consider the following organisms :

1. Agaricus

2. Nostoc

3. Spirogyra

Which of the above is/are used as biofertilizer/ fertilizers?

I.A.S. (Pre) 2013

[Earth - Tropics, Volcanoes, Tides, cyclones, Corals ETC. Part 8]

1 and 2

Only 2

2 and 3

Only 3

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