UPSC CSAT 2011 Paper I - Complete Solved Paper

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Multiple Choice

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?

  1. 1 and 4
  2. 2 and 3
  3. 2, 3 and 4
  4. 1, 2, 3 and 4
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