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The model shows the lightdependent reactions and the Calvin Cycle within a cell. Chloroplast C*O_{2} Water MADP^ +; ADP + P ATP- NADPH Glucose O_{2} Which question can be answered about the light-dependent reactions ? Where is water broken down? Where is oxygen used ? Where is CO2 used? dWhere is glucose formed ?

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The question that can be answered about the light-dependent reactions is: "Where is water broken down?"

In the light-dependent reactions of photosynthesis, water (H₂O) is split (or broken down) to provide electrons and protons, a process known as photolysis. This occurs in the thylakoid membranes of the chloroplasts, where the light energy is captured and used.

The other questions relate to different aspects of photosynthesis:

  • Where is oxygen used? This refers to the light-independent reactions (Calvin Cycle), where oxygen is not directly used.
  • Where is CO₂ used? This is also related to the Calvin Cycle, where carbon dioxide is fixed to form glucose.
  • Where is glucose formed? Glucose is synthesized in the Calvin Cycle, not in the light-dependent reactions.

So, the correct answer focusing on the light-dependent reactions is indeed about where water is broken down.