Consider the following: Photosynthesis Respiration Decay of organic matter volcanic action Which of the above add carbon dioxide to the carbon cycle on Earth? - Neyyar App | A New Age Marketplace for Global Education

Consider the following:

Photosynthesis
Respiration
Decay of organic matter
volcanic action

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:

Sources of Carbon Dioxide in the Carbon Cycle:

Volcanic action
Respiration
Decomposition

Photosynthesis takes up Carbon dioxide and releases oxygen, but it does not add carbon dioxide to the carbon cycle.

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