pyq/2014/prelims/19

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.

(A) 1 and 3 only

(B) 2 only

(C) 1, 2 and 4 only

(D) 1, 2, 3 and 4