Question

Short /Long answer type question.
How many quanta of light energy is required to produce chemical energy to fix one molecule of $C{O}_2$ into a sugar phosphate?

Answer 1

Emerson found that 8 quanta of light energy would be required for the reduction of one molecule of CO2 to carbohydrate, that is, one molecule of O2 is produced. As we the photosynthesis occur first the electron transport and then the carbon fixation. So to make up the glucose phosphate we will require 6Co${}_2$ molecule. So according to the above observation, we will require 6×8=48 photons.