can you explain why twelve molecules of water as substrate are used in the equation of photosynthesis Share with your friends Share 0 Jahirul Mazumder answered this Please refer the link: https://www.meritnation.com/ask-answer/question/why-12-molecules-of-water-as-substrate-are-used-in-the-equat/photosynthesis-in-higher-plants/6834094 0 View Full Answer