Consider the following: 1. Photosynthesis 2. Respiration 3. Decay of organic matter 4. Volcanic action Which of the above add carbon dioxide to the carbon cycle on Earth?
A1 and 4 only
B2 and 3 only
C2, 3 and 4 only
D1, 2, 3 and 4
Answer & Solution
Correct answer: C. 2, 3 and 4 only
UPSC CSE Prelims 2011 (GS-I, Set A), Q.48. Official answer key: C.
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