GyanGramQuestion
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.
PRELIMS 2013 · ENVIRONMENT
Which of the following adds/add nitrogen to the soil? 1. Excretion of urea by animals 2.…
Attempt this previous-year question. The correct option stays hidden until you choose.
Pick an option to check yourself.
• Correct Answer: C
• Animal excretion (urea) is mineralized by soil bacteria into ammonia, adding nitrogen. Death of vegetation releases nitrogen via decomposition and ammonification.
• 2 is wrong: Burning coal releases nitrogen oxides into the atmosphere as flue gases; fly ash is nitrogen-poor and does not directly add nitrogen to soil.
Keep going in GyanGram.
Attempt Prelims MCQs or open Mains questions by paper — then continue the same bank inside the app with visual decks.