UPSC CSE Prelims 2011 Q48 — Environment & Ecology PYQ

2011Q48·Environment & Ecology·Biogeochemical Cycles & Earth Systems

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 ?

UPSC CSE Prelims 2011 Q48 — Environment & Ecology PYQ with Answer

UPSC CSE Prelims 2011 Q48 — Environment & Ecology PYQ with Answer