state gov Kerala PSC Degree (Common Preliminary Examination) Mock Test Series 2025 General Knowledge Ecology and Environment Environmental pollution
Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?
1. Volcanic action
2. Respiration
3. Photosynthesis
4. The decay of organic matter
Select the correct answer using the code given below
1
1 and 3 only
2
2 only
3
1, 2 and 4 only
4
1, 2, 3 and 4