GyanGramWhich of the following adds/add nitrogen to the soil? 1. Excretion of urea by animals 2. Burning of coal by m…
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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
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• 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.
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