Consider the following organisms:

  1. Agaricus
  2. Nostoc
  3. Spirogyra

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

[UPSC Civil Services Exam – 2013 Prelims]

(a) 1 and 2

(b) 2 only

(c) 2 and 3

(d) 3 only


Answer: (b)        

Explanation:

  • Option 2 is the correct answer because Nostoc, a type of free-living bacteria, has the ability to fix atmospheric nitrogen into a form that is beneficial for plant growth.
  • This makes it a potential sustainable biofertilizer, unlike Spirogyra which is not commonly used for this purpose and can even compete with plants if introduced into the soil.
  • Agaricus, on the other hand, is a mushroom species that is known for its edible varieties.

Consider the following statements:                                                                   The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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Consider the following statements:                                                         The Parliament of India can place a particular law in the Ninth Schedule of the Constitution of India. The validity of a law placed in the Ninth Schedule cannot be examined by any court and no judgement can be made on it. Which of the statements given above is/are correct?

Consider the following statements:                                               

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