During photosynthesis, the overall chemical equation is:
\[ 6 , \text{CO}_2 + 6 , \text{H}_2\text{O} \rightarrow \text{C}6\text{H}{12}\text{O}_6 + 6 , \text{O}_2 \]
This equation shows that it takes 6 molecules of water (H₂O) to produce one molecule of glucose (C₆H₁₂O₆). Therefore, the answer is:
a. 6
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