Splitting water into hydrogen and oxygen in photosynthesis needs energy from where

Answer 1

Splitting water into hydrogen and oxygen in photosynthesis requires energy from sunlight. This process is known as the light-dependent reactions of photosynthesis, where light energy is absorbed by chlorophyll in the chloroplasts of plant cells and used to split water molecules into hydrogen and oxygen. The oxygen is released as a byproduct, while the hydrogen is used to produce ATP and NADPH, which are used in the light-independent reactions of photosynthesis to produce glucose.