The model shows the light-dependent reactions and the Calvin Cycle within a cell. Which question can be answered about the light-dependent reactions? aWhere is oxygen used? bWhere is glucose formed? cWhere is CO2 used? dWhere is water broken down?

The question that can be answered about the light-dependent reactions is:

**d. Where is water broken down?**

During the light-dependent reactions of photosynthesis, water is split (a process known as photolysis) to provide electrons and protons, and oxygen is released as a byproduct. The other options pertain to processes that occur in the Calvin Cycle or other stages of photosynthesis, not specifically in the light-dependent reactions.