Question
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
(e) 1 and 3 only
(d) 1, 2 and 3
Answer:
C
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Explanation:
Excretion of urea by animals: Animal excretion, particularly urea, contains nitrogen compounds that can contribute to nitrogen enrichment in the soil.
Burning of coal by man: Burning coal does not add nitrogen to the soil. It releases various gases and pollutants into the atmosphere but does not directly contribute nitrogen to the soil.
Death of vegetation: When plants die, their organic matter decomposes, and nitrogen present in their tissues is released into the soil. This process is known as nitrogen mineralization.