UPSC 2013 › Environment & Ecology › Biogeochemical Cycles & Earth Systems

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UPSC 2013 · Q34 · Environment & Ecology › Biogeochemical Cycles & Earth Systems · Save

Which of the following adds/add nitrogen to the soil?

  1. Excretion of urea by animals
  2. Burning of coal by man
  3. Death of vegetation

Select the correct answer using the codes given below.

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Show answer
Answer: (c) 1 and 3 only