Photosynthesis - PowerPoint PPT Presentation

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Photosynthesis

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  1. Photosynthesis

  2. 1. Mesophyll 1. Mesophyll A layer of cells that contain & are responsible for most of the plant’s photosynthesis chloroplasts Page 2

  3. Page 2 O2 CO2 2. Stomata Openings in plant leaves that allow for to occur gas exchange Carbon Dioxide (CO2) passes in and (O2) passes out. Oxygen

  4. Mesophyll Cell 3. Chloroplast The site of ___________ Photosynthesis Double-membrane bound organelle 4. Outer membrane 5. Inner membrane Page 2

  5. 8. Grana 6. Stroma: 7. Thylakoid Fluid filled space within the chloroplast resides in these membranes Chlorophyll 8. Grana: A stack of _________ thylakoids Page 2

  6. Page 5 Why are leaves green?Substances that absorb light are called pigments Carotenoids Chlorophyll a Chlorophyll b Chlorophyll absorbs and light, reflecting red blue green

  7. Photosynthesis • Occurs in 2 Steps: • Light Reactions in the thylakoid • Calvin Cycle in the stroma. • Calvin Cycle is also referred to as the Dark Reactions or Light Independent Reactions Calvin Cycle (Light Independent or Dark Reactions)

  8. Photosynthesis: The Light Reaction Chloroplasts • are chemical factories powered by the sun. • The particles of sunlight are called _________ photons Page 5

  9. Photosynthesis: The Light Reaction • Their thylakoids have the pigment chlorophyll. • Chlorophyll act like solar panels that transform light energy into energy carriers called and . • To make and , the thylakoid usesand makesgas. NADPH ATP NADPH ATP water (H2O) oxygen (O2) Page 5

  10. Summary of Light Reactions 6 H20 NADPH ATP 6 O2

  11. NADPH What are and used for in Photosynthesis? ATP

  12. ATP ATP & NADPH energy are used to convert CO2 into glucose NADPH 6 CO2 This is done during the Calvin Cycle in the stroma… Sugar!

  13. Summary of Photosynthesis 6 CO2 6 H20 NADPH Calvin Cycle ATP C6H12O6 (sugar) 6 O2

  14. Photosynthesis Equation: • The General Formula for Photosynthesis is: 6CO2 + 6H2O + (Light ) C6H12O6 + 6O2 Calvin CycleLight ReactionsLight ReactionsCalvin CycleLight Reactions

  15. Photosynthesis is responsible for the majority of the biomass in our biosphere

  16. This biomass supports the upper trophic levels, but only 10% of their energy can be transferred up the food chain

  17. Let’s play the photosynthesis magnet board race!