Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
- Volcanic action
- Respiration
- Photosynthesis
- Decay of organic matter
Select the correct answer using the code given below.
[UPSC Civil Services Exam – 2014 Prelims]
(a) 1 and 3 only
(b) 2 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4
Answer: (c)
Explanation:
- The process of photosynthesis absorbs carbon dioxide and releases oxygen, meaning that it does not contribute to the addition of carbon dioxide to the carbon cycle. Therefore, Statement 3 is incorrect.
- Volcanic activity results in the emission of carbon dioxide.
- Respiration involves the intake of oxygen from the external environment into tissues and the release of carbon dioxide in the opposite direction.
- Decomposition releases carbon dioxide into the atmosphere.
