Absorption of Light: Chlorophyll, the green pigment in plant cells, absorbs sunlight. This occurs primarily in the chloroplasts, which are specialized organelles in plant cells.Water Splitting: The absorbed light energy is used to split water molecules (H₂O) into oxygen (O₂), protons, and electrons. The oxygen is released as a byproduct into the atmosphere.Formation of Energy Carriers: The electrons and protons are used to create energy-rich molecules such as ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate).Carbon Fixation: In the Calvin cycle, which takes place in the stroma of the chloroplast, ATP and NADPH are used to convert carbon dioxide (CO₂) from the air into glucose (C₆H₁₂O₆). This is done through a series of chemical reactions.