Photosynthesis and Respiration


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Photosynthesis and Respiration

  1. 1. Photosynthesis & Respiration
  2. 2. What is Photosynthesis? It is the process by which plants, algae, and some bacteria use sunlight, carbon dioxide, and water to make the sugar glucose. The process of photosynthesis is a chemical reaction. It is the most important chemical reaction on our planet.
  3. 3. What is the equation for the chemical reaction of photosynthesis?
  4. 4. What is the equation for the chemical reaction of photosynthesis?
  5. 5. Describe Photosynthesis • The process of changing light energy to chemical energy • Energy stored as sugar • Occurs in plants and some algae • Plants need light energy, CO2, and H2O • Takes place in the chloroplasts, using chlorophyll, the green pigment in plants
  6. 6. What happens during photosynthesis? • Plants capture light energy and use that energy to make glucose • Sunlight provides the energy needed by chlorophyll to change molecules of carbon dioxide and water into glucose • Oxygen is also released in this reaction
  7. 7. What happens during photosynthesis? • Carbon dioxide enters the leaf through holes called stomata
  8. 8. What happens during photosynthesis? • CO2 combines with the stored energy in the chloroplasts through a chemical reaction to make glucose
  9. 9. What happens during photosynthesis? • The sugar is moved through tubes in the leaf to the roots, stems and fruits of the plants • Some of the sugar is used right away by the plant for energy; some is stored as starch; and some is built into plant tissue
  10. 10. Why is this important to us? We cannot make our own food (glucose, energy), we must get our food from plants. Plants are the first step in the food chain.
  11. 11. Why is this important to us? The oxygen released during photosynthesis is necessary for all living things.
  12. 12. Learn more about photosynthesis at:
  13. 13. What is Cellular Respiration?
  14. 14. What is Cellular Respiration? The release of chemical energy for use by cells.
  15. 15. What is Cellular Respiration? Once the energy that was in sunlight is changed into chemical energy by photosynthesis, an organism has to transform the chemical energy into a a form that can be used by the organism. This process is cellular respiration.
  16. 16. Describe Cellular Respiration
  17. 17. Describe Cellular Respiration • The breakdown of glucose molecules to release energy • Takes place in all living things • Is a step by step process
  18. 18. What is the chemical equation for cellular respiration?
  19. 19. Read how photosynthesis & respiration are related: er00/8th/energy/sciber/photosyn.htm