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   ocr: HE PROCESS of photosynthesis can be written as a word equation: chlorophyll Carbon dioxide glucose + water oxygen - - sunlight Although this is a useful summary ofwhat happens, it makes photosynthesis look like a one-step process. In fact, there are two stages in photosynthesis. During the first stage chlorophyll traps the energy in sunlight. At the same time, water molecules split up into hydrogen and oxygen atoms. The oxygen is released into the air as al waste product. The second stage does not need light. The energy trapped from sunlight in the first stage 1s used to join hydrogen (from wa ...