Biology - Cell Biology - Advanced - Photosynthesis - light reactions - Light-Dependent Reactions
5-step explanation. Step 1: 'LOCATION: Thylakoid membranes inside chloroplasts. The stacked disc-like structures (grana) where chlorophyll is embedded.' Step 2: 'PHOTOSYSTEM II (starts here!): Light hits chlorophyll → electrons get excited and leave. Water is split (photolysis: 2H₂O → 4H⁺ + 4e⁻ + O₂