Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
- Volcanic action
- Respiration
- Photosynthesis
- The decay of organic matter
Select the correct answer using the code given below.
Detailed Explanation:
✅ Statement 1 – Correct: Volcanic eruptions release CO₂ trapped in the Earth's mantle and crust into the atmosphere.
✅ Statement 2 – Correct: Respiration by living organisms releases CO₂ as a byproduct of cellular metabolism.
❌ Statement 3 – Incorrect: Photosynthesis removes CO₂ from the atmosphere; plants use it to produce glucose and oxygen.
✅ Statement 4 – Correct: Decomposition of dead organic matter by decomposers releases CO₂ back into the atmosphere.
Question 4 of 6 Structure and Functions of Ecosystem
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