Biochemistry 4th Edition by Christopher Mathews,Kensal van Holde, Dean Appling, Spencer Anthony Cahill

Exercise 12

If a photosynthetic organism is illuminated in a closed, sealed environment, it is observed that the CO₂ and O₂ levels in the surrounding atmosphere reach a constant ratio.
(a) Suggest an explanation.
(b) What factor would you think primarily determines the value of this ratio