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The first law of thermodynamics tells us that matter cannot be created or destroyed. It cannot come from nothing and it cannot disappear. So the same number of atoms (C, H, O) have to enter and leave. He proposed the word "photosyntax which met with favor. In the discussion Professor MacMillan suggested the word "photosynthesis as etymologically more satisfactory and accurate, a claim which Dr. Barnes showed could not be maintained. Some of the carbohydrates, the sugars, can then be transported around the organism for immediate use; others, the starches, can be stored for later use. Compare chemosynthesis. See Note at transpiration. Now how many oxygen atoms are in the glucose? 6. So you have oxygen atoms left over. That is where the O2 comes from. It is the left over material from making sugar. Noun, Biology, Biochemistry. 1. the complex process by which carbon dioxide, water, and certain inorganic salts are converted into carbohydrates by green plants, algae, and certain bacteria, using energy from the sun and chlorophyll.
The answer is, they do not. Plants actually hold on to a small amount of the oxygen they produced in photosynthesis and use that oxygen to break down carbohydrates to give them energy.
Ltd. 1979, 1986 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source Word Origin and History for photosynthesis n. 1898, loan-translation of German Photosynthese, from photo- "light" (see photo- ) synthese "synthesis" (see synthesis ).