UPSC Prelims 2014 – Question 19

Q: Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?

a) Volcanic action

b) Respiration

c) Photosynthesis

d) Decay of organic matter

The Correct Answer is 1, 2 and 4 only.

• Producers remove the carbon dioxide from the atmosphere and hydrosphere through the process of photosynthesis. They convert carbon dioxide to glucose. Hence, Statement 3rd is wrong.
• The process of respiration releases carbon dioxide back to air or water (aquatic ecosystem). Hence, Statement 2nd is correct.
• Decomposers release carbon stored in bodies of dead organisms back to the atmosphere. Hence, Statement 4th is correct.
• Volcanoes emit carbon dioxide in two ways: during eruptions and through underground magma. Hence, Statement 1 correct.

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