During photosynthesis, the chemical equation can be summarized as:
\[ 6 \text{CO}_2 + 6 \text{H}_2\text{O} \rightarrow \text{C}6\text{H}{12}\text{O}_6 + 6 \text{O}_2 \]
This means that for one molecule of glucose (C₆H₁₂O₆) produced, 6 molecules of water (H₂O) are used. Therefore, the number of molecules of water that are recycled when one molecule of glucose is created is 6.
So the correct response is: 6.