Biology

The role of sunlight in the light-dependent reactions is to provide energy to split water molecules.

In the light-dependent reactions of photosynthesis, which occur in the thylakoid membranes of chloroplasts, sunlight is absorbed by pigments such as chlorophyll. The energy from the absorbed photons of sunlight is used to excite electrons within the pigment molecules. This energy is then harnessed to drive the splitting of water molecules (H₂O) in a process called photolysis (

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