Here's why:

* Photolysis is the process where water molecules are split apart by light energy. This occurs within the thylakoid membrane of chloroplasts.

* Light-dependent reactions are the first stage of photosynthesis, where light energy is captured and used to produce ATP and NADPH. These molecules are then used in the light-independent reactions (Calvin cycle) to produce glucose.

Key points about photolysis:

* Location: Thylakoid membrane of chloroplasts

* Purpose: To provide electrons for the electron transport chain and to generate oxygen as a byproduct

* Process: Light energy excites electrons in chlorophyll, which then excite water molecules, causing them to split into oxygen, hydrogen ions (H+), and electrons.

Other photosynthetic reactions:

* Light-independent reactions (Calvin cycle): Occur in the stroma of chloroplasts and use ATP and NADPH to convert carbon dioxide into glucose. Photolysis does not occur here.

Let me know if you have any other questions!