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  1. 1. Photosynthesis Description
  2. 2. Photosynthesis <ul><li>This is the production of organic compounds, including carbohydrates, proteins, and lipids, by using light energy and simple inorganic substances such as carbon dioxide and water. </li></ul><ul><li>Photosynthesis involves the conversion of light energy into chemical energy </li></ul>
  3. 3. Photosynthesis and the Sun <ul><li>The first stage in photosynthesis is the absorption of sunlight. Visible light is a form of electromagnetic radiation. </li></ul><ul><li>Sunlight is a mixture of different wavelengths of visible light; we see these as colors such as blue, green, and red. </li></ul>
  4. 4. Light absorption & Chlorophyll <ul><li>Light absorption in photosynthesis involves substances that are called pigments. The main pigment that is used in photosynthesis is chlorophyll </li></ul><ul><li>Pigments that absorb all the colors appear black, because they emit no light. Since chlorophyll appears green it would be obvious to see that it absorbs red and blue and reflects the color green which is why plants appear green to the human eye. </li></ul>
  5. 5. Light and photosynthesis <ul><li>Light intensity can affect the rate of photosynthesis. At lower intensities of light the rate of photosynthesis increases as the intensity of light increases. </li></ul><ul><li>Several essential steps in photosynthesis are achieved using the light energy absorbed by chlorophyll: </li></ul><ul><li>ATP is produced, from ADP phosphate. </li></ul><ul><li>Water molecules are split to release hydrogen (photolysis) </li></ul>
  6. 6. Hydrogen and photosynthesis <ul><li>Hydrogen is needed in a later stage of photosynthesis to make carbohydrates. Splitting water also releases oxygen, which is a toxic waste product and is allowed to diffuse out into the surrounding water or air. </li></ul>
  7. 7. Carbon Dioxide <ul><li>Carbon dioxide in the atmosphere has been rising yet it is still low enough to affect the rate of photosynthesis at times </li></ul><ul><li>Carbon Dioxide is essential for photosynthesis as it is the source of the carbon that is needed to make organic molecules. </li></ul><ul><li>The conversion of carbon dioxide into a solid or liquid carbon compounds is called carbon fixation. </li></ul>
  8. 8. Temperature and photosynthesis <ul><li>Temperature is another factor that can have an affect of photosynthesis but it has a slightly different relationship. </li></ul>