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Photosynthesis

Learn about the process of photosynthesis, where plants and bacteria convert carbon dioxide and water into glucose and oxygen. Discover the two stages of photosynthesis, absorption of light energy and conversion into chemical energy, and the storage of energy in the form of carbohydrates. Explore the light-dependent reaction and the Calvin cycle, and understand how factors like temperature, light intensity, carbon dioxide, and water affect the rate of photosynthesis.

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Photosynthesis

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  1. Photosynthesis Using Light Energy to Make Food

  2. Photosynthesis • Plants use energy to change carbon dioxide and water into glucose and oxygen (waste product)

  3. Who performs Photosynthesis? • Plants and a few bacteria • These are called autotrophs

  4. Three major events take place in two stages: • Absorption of light energy • Conversion of light energy into chemical energy (ATP and NADPH) • Storage of energy in the form of carbohydrates

  5. Where does it happen? • Chloroplasts: • Thylakoids (a single pancake) • Contain chlorophyll • Grana (stacks) • Granum is one stack. • Stroma (thick fluid that surrounds the grana) omega.dawsoncollege.qc.ca/ ray/cell/401cell.htm

  6. Light Dependent Reaction • Temperature independent • Light Reaction • Light Independent Reaction • Calvin-Benson Cycle • Dark Reaction www.emc.maricopa.edu/faculty/ farabee/BIOBK/BioBookPS.html

  7. Light Reaction • Requires direct light energy • Occurs in the thylakoids of chloroplasts • 2 steps occur here: • Absorption of light by pigments • Splitting of water

  8. Electron carriers • Light dependent reaction • They gain tons of energy! • Cells use electron carriers to transport this energy to other molecules • Called electron transport (name of process) • 2 types in photosynthesis • NADP+ • Carriers 2 high energy electrons and hydrogen ions • Create NADPH • ATP

  9. Light Dependent Reaction (depends on light) • Inputs=sun and water • Products formed • Oxygen gas-formed by splitting water • Electrons transported to create NADPH and ATP • used in the Calvin-Benson cycle

  10. Calvin Cycle • Occurs in the stroma (filler in chloroplasts) • Also called the dark reaction • Carbon dioxide is the input and the NADPH and ATP from the light reaction • The output is glucose • It is used for food and energy. • Formula for glucose • C6H12O6

  11. ----> The Equation Sunlight+ 6CO2 + 6H20 C6H12O6 + 6 02

  12. Factors that effect the rate of photosynthesis • Temperature • Enzymes are important for photosynthesis to work. • Enzymes work best in certain temperatures. • If the temp is too low or too high, it can decrease it or stop photosynthesis. • Light intensity • Increase light will increase photosynthesis to a point. • Amount of Carbon Dioxide • Amount of water

  13. http://www.brainpop.com/science/cellularlifeandgenetics/photosynthesis/http://www.brainpop.com/science/cellularlifeandgenetics/photosynthesis/ • Username: cebrainpop • Password: tiger1

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