GyanGramQuestion
Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
1. Volcanic action
2. Respiration
3. Photosynthesis
4. The decay of organic matter
Select the correct answer using the code given below.
PRELIMS 2014 · ENVIRONMENT
Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth? 1…
Attempt this previous-year question. The correct option stays hidden until you choose.
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• Correct Answer: C
• Volcanic action releases CO₂ from Earth’s interior. Respiration by all organisms releases CO₂ as a metabolic byproduct. Decay of organic matter by decomposers returns carbon to the atmosphere.
• 3 is wrong: Photosynthesis absorbs CO₂ (carbon sink), converting it into carbohydrates and O₂; it does not add CO₂ to the cycle.
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