Plant physiology : photosynthesis, role of CO2 and stomata importance

Photosynthesis is a bioenergetic process occurring in chlorophyll cells (located in chloroplasts) when photosynthetic active radiation (PAR) light is present. CO2 is an essential gas for the process of photosynthesis. This gas is present quite naturally in the atmosphere in an approximate proportion of 0.038%, or 380 ppm.