Consider the following:
- Photosynthesis
- Respiration
- Decay of organic matter
- Volcanic eruption
Which of the above add carbon dioxide to the carbon cycle on earth?
[UPSC Civil Services Exam – 2011 Prelims]
(a) 1 and 4 only
(b) 2 and 3 only
(c) 2, 3 and 4 only
(d) 1, 2, 3 and 4
Answer: (c)
Explanation:
- The statement “photosynthesis does not add carbon dioxide to the carbon cycle” is incorrect, as photosynthesis actually removes carbon dioxide and releases oxygen.
- Carbon dioxide is released through volcanic activity and respiration, and decomposition also contributes to the release of carbon dioxide.
