In photosynthesis, To fix one CO2 molecule we need 8 photons so to fix 6 carbon molecule i.e for glucose we need 48 photons. If youre after the exact number, the other answers will suffice.
They found that some 2500 molecules of chlorophyll was required to produce one molecule of oxygen, and that a minimum of eight photons of light must be absorbed in the process.
As we the photosynthesis occur first the electron transport and then the carbon fixation. So to make up the glucose phosphate we will require 6Co2 molecule. So according to the above observation, we will require 6×8=48 photons.
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