Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth? 1. Volcanic action 2. Respiration 3. Photosynthesis 4. Decay of organic matter Select the correct answer using the code given below.
A1 and 3 only
B2 only
C1, 2 and 4 only
D1, 2, 3 and 4
Answer & Solution
Correct answer: C. 1, 2 and 4 only
UPSC CSE Prelims 2014 (GS-I, Set A), Q.19. Official answer key: C.
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