UPSC 2013 • Q34Environment, Ecology & Climate ChangeMedium
Ecosystem Principles & Ecological Interactions
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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Consider the following: 1. Photosynthesis 2. Respiration 3. Decay of organic matter 4. Volcanic action. Which of the above add carbon dioxide to the carbon cycle on Earth?
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