The first step in photosynthesis is:

Explanation

Light Absorption: Chlorophyll molecules, organised into photosystems in the thylakoid membranes, capture photons of light. Electron Excitation: The absorbed light energy excites an electron to a higher energy level. Electron Transfer: The high-energy electron is passed from the chlorophyll molecule to a primary electron acceptor, initiating the flow of electrons through an electron transport chain. Water Splitting (Photolysis): To replace the lost electron, a water molecule is split. This process releases oxygen as a byproduct, along with protons and electrons that replenish the chlorophyll.