Q79.
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.
Answer
C
Explanation
Volcanic action, respiration and decay of organic matter release carbon dioxide into the atmosphere. Photosynthesis actually removes carbon dioxide from the atmosphere (it does not add CO2).