GyanGramWhich of the following adds/add carbon dioxide to the carbon cycle on the planet Earth? 1. Volcanic action 2.…
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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
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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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