The energy of the sun is harnessed by the photon center in the chlorophyll pigment. This energy is used in the photolysis of water (splitting of a water molecule) and the energy transferred to ATP and NADP. This occurs in the grana and is a light-dependent reaction.
2H2O --> 4H+ + O2 + 4e- (photolysis)
Then the light-independent reaction occurs in the stroma where the H+ ions, ATP and NADPH, from the first stage are used to reduce carbon dioxide to glyceraldehyde 3-phosphate, which is the first sugar molecule.Answer:
Photosynthesis is a process which converts the light energy to chemical energy which is stored as glucose molecule in the green plants. This process of photosynthesis proceeds in two phases: light-independent phase and light-dependent phase.
The conversion of light energy to chemical energy takes place during the light-dependent phase which begins with capturing of the light energy by the photo-systems present in the chloroplast. The light energy initiates a cascade of reactions as the light energy causes the release and excitation of an electron from the chlorophyll.
This electron moves through the reaction center and enters the electron transport chain. the scarcity of electron at chlorophyll is fulfilled by the photolysis of the water. The electron transport chain help generates the ATP and NADPH molecule in the thylakoid granum which is utilized during the Calvin cycle to produce glucose molecule.
