pyq/2011/prelims/48

Consider the following :

1. Photosynthesis.

2. Respiration.

3. The decay of organic matter.

4. Volcanic action.

Which of the above add carbon dioxide to the carbon cycle on Earth?

(A) 1 and 4 only

(B) 2 and 3 only

(C) 2, 3 and 4 only

(D) 1,2,3 and 4