UPSC CSE Prelims
Energy Flow in Ecosystem Previous Year Questions (PYQs)
Practice solved questions for Energy Flow in Ecosystem with detailed step-by-step solutions, key insights, and trend analysis for UPSC CSE PRELIMS.
Solved Previous Year Questions
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Which of the following adds/add nitrogen to the soil?
- Excretion of urea by animals
- Burning of coal by man
- Death of vegetation
Select the correct answer using the codes given below.
Detailed Explanation:
✅ Statement 1 – Correct: Urea (CO(NH₂)₂) excreted by animals is decomposed by soil microbes into ammonia, which is further converted into nitrates and nitrites, adding nitrogen to soil.
❌ Statement 2 – Incorrect: Burning of coal releases nitrogen oxides (NOₓ) into the atmosphere, not directly into soil; these contribute to air pollution and acid rain.
✅ Statement 3 – Correct: Death of vegetation leads to decomposition by bacteria and fungi, which breaks down organic matter and releases nitrogen compounds back into soil.
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