Civil Services Prep

Prelims 2013 · Science and Technology · Question 83

Consider the following organisms:

  1. Agaricus
  2. Nostoc
  3. Spirogyra

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

  1. 1 and 2
  2. 2 only
  3. 2 and 3
  4. 3 only

Answer

2 only

1. Agaricus – It is a fungus (mushroom) and is not used as a biofertilizer. Verdict: Incorrect.

2. Nostoc – It is a nitrogen-fixing cyanobacterium and is used as a biofertilizer, especially in paddy fields. Verdict: Correct.

3. Spirogyra – It is a green alga and is not a standard biofertilizer organism. Verdict: Incorrect.

Hence, only 2 is used as a biofertilizer.

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