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Photosynthesis shows a decrease in entropy, going from carbon dioxide and water to carbohydrates (i.e. sugars). How do you explain this?
Only a small spectrum of the light in the immediate environment of the plant – can be used for photosynthesis – the rest is discarded.
So then - photosynthesis shows a "decrease in entropy" in what?? In "the plant"?? Or in "each reaction"? My argument is about 'each reaction' when the reaction and its immediate environment are taken into account.
In photosynthesis there is a cumulative generation of entropy, first during the photosynthesis of glucose, and then through the respiration of glucose back into carbon dioxide and water.
(not to mention all of the other processes of life which go into circulating glucose through the biome)
This guarantees that the entropy always increases. This relentless increase in entropy, along with the conservation of energy (in terms of heat, internal energy and work) make up the two "laws" of thermodynamics.
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For photosynthesis while the entropy of the system decreases, the corresponding increase in entropy of the surroundings (e.g. from heat created during photosynthesis and the breakdown of water to oxygen gas and protons) will make the overall change in entropy positive.
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