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Photosynthesis light Water + carbon dioxide › glucose + oxygen 6H2O + 6CO2 › C6H12O6 + 6O2 Absorption Spectrum An absorption spectrum shows which wavelength of light a molecule absorbs. Action Spectrum An action spectrum shows the effect of each wavelength of light on the rate of photosynthesis The absorption spectrum of chlorophyll is very similar to the action spectrum of photosynthesis. This is evidence that chlorophyll absorbs light for photosynthesis. The Light and Dark Reaction 1) The light reaction light 6H2O›12H + 3O2 Light splits water into hydrogen ions and oxygen. 2) The dark reaction enzymes 12H + 6CO2 › C6H12O6 + 3O2 Glucose is then formed from the hydrogen ions and carbon dioxide. (This reaction does not occur in the dark). Factors affecting the rate of photosynthesis The Light Reaction Chlorophyll can split more water molecules at higher light intensities. Photosynthesis will reach a maximum rate when chlorophyll is saturated by sunlight. The Dark Reaction An increase in temperature will increase the rate of glucose production until...

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