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

  1. (a)1 and 2
  2. (b)2 only
  3. (c)2 and 3
  4. (d)3 only
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Official answer(b) 2 only