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Photosynthesis

Photosynthesis . Photosynthesis: uses the energy of sunlight to convert water and carbon dioxide into high energy carbohydrates6CO2 6H2O ---light? C6H2O6 6O2Carbon dioxide water --- light? sugars oxygen . Photosynthesis Equation. 6CO2 6H2O ---light? C6H2O6 6O2Reactants: carbon di

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Photosynthesis

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    1. Photosynthesis Chapter 8-2 and 8-3

    2. Photosynthesis Photosynthesis: uses the energy of sunlight to convert water and carbon dioxide into high energy carbohydrates 6CO2 + 6H2O ---light? C6H2O6 + 6O2 Carbon dioxide + water --- light? sugars + oxygen

    3. Photosynthesis Equation 6CO2 + 6H2O ---light? C6H2O6 + 6O2 Reactants: carbon dioxide water Products: carbohydrates oxygen

    4. Who does photosynthesis? Plants and other organisms that contain the pigment, chlorophyll Chlorophyll is stored in the chloroplasts of a plant cell

    5. Where does photosynthesis happen? Photosynthesis occurs within the chloroplasts

    6. Chloroplasts Thylakoids- photosynthetic membranes Granum- stack of thylakoids Stroma- space outside the thylakoids Photosystems- clusters of pigment & protein that absorb light energy (I & II)

    7. Two Parts of Photosynthesis Light dependent reactions- take place within the thylakoid membranes Light independent reactions (Calvin Cycle)- takes place within the stroma

    8. Light Dependent Reactions Figure 8-10 on page 211 Sunlight is absorbed by Photosystem II The sunlight breaks down water molecules stored within Photosystem II The water is broken and its electrons gain energy These excited electrons leave the photosystem and are passed through an electron transport chain

    9. Light Dependent Reactions As the electrons move, they provide energy to move H+ ions from the stroma across the thylakoid membrane into the thylakoid When the electrons reach Photosystem I, they are reenergized by sunlight

    10. Light Dependent Reactions The reenergized electrons are picked up by NADP and are used to create NADPH At the same time, electrons inside the thylakoid create a concentration gradient of H+ ions This gradient is used to power an enzyme called ATP synthase, which synthesizes ATP

    11. Light Dependent Reactions Reactants: water sunlight NADP ADP Products: Oxygen NADPH ATP

    12. Electron Transport

    13. ATP Synthase

    14. Light Independent Reactions: The Calvin Cycle The Calvin Cycle uses the NADPH and ATP produced in the light dependent reactions to create high energy sugars Figure 8-11 on page 212

    15. The Calvin Cycle Carbon dioxide molecules from the atmosphere enter the stroma The carbon dioxide joins with other carbon molecules to form 3-carbon molecules called PGA The PGA molecules use energy from ATP and NADPH to convert into PGAL

    16. The Calvin Cycle Some of the PGAL leaves the cycle and is used in other parts of the plant cell But the majority of PGAL molecules are converted back into PGA and continue in the cycle After six rounds of the Calvin Cycle, one molecule of glucose is produced

    17. The Calvin Cycle Reactants: Carbon Dioxide NADPH ATP Products: Glucose

    18. The Calvin Cycle

    19. Photosynthesis

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