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Announcements. Start new unit Photosynthesis and cellular respiration Describe the four levels of organization? What color are most plants? Why is that?. Photosynthesis. Ch 8-1 Ch 8-2. Photosynthesis.

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Announcements

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  1. Announcements • Start new unit • Photosynthesis and cellular respiration • Describe the four levels of organization? • What color are most plants? Why is that?

  2. Photosynthesis Ch 8-1 Ch 8-2

  3. Photosynthesis • When I plant a seed that weighs 1 gram, how does it grow into a huge sequioa tree which weighs tons? • Where does the extra weight come from? The soil? The water? • Dutch Physician Jan Van Helmont • Soil weighed constantly 75 grams • Water was the only thing he added • Joseph Priestley • Observed a plant keep a flame alive underneath a glass dome • Jan Ingenhousz figured out that plants produce oxygen in light • Photosynthesis • Plants convert the energy of sunlight into the energy in the chemical bonds of carbohydrates

  4. Requirements for Photosynthesis • Sunlight – different wavelengths of visible light are needed for photosynthesis • Autotrophs – organisms that can make their own source of food. Ex. Plants • Heterotroph – organisms that obtain energy from another source. Ex. People • Pigments – absorb the specific wavelengths (colors) from light • Chlorophyll is the primary pigment in plants. • Energy storing compounds • ATP (adenosine triphosphate) – power currency of the cell

  5. Requirements for Photosynthesis

  6. ATP Section 8-1 Adenine Ribose 3 Phosphate groups Go to Section:

  7. Figure 8-3 Comparison of ADP and ATP to a Battery Section 8-1 ADP ATP Energy Energy Adenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP) Partially charged battery Fully charged battery Go to Section:

  8. Figure 8-3 Comparison of ADP and ATP to a Battery Section 8-1 ADP ATP Energy Energy Adenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP) Partially charged battery Fully charged battery Go to Section:

  9. “Simplified” EQUATIONFORPHOTOSYNTHESIS Energy (Light) 6CO2 + 6H2O + C6H12O6 + 6O2 CARBON DIOXIDE GLUCOSE OXYGEN WATER

  10. Photosynthesis + H2O CO2 Energy ATP and NADPH2 Water is broken Light is Adsorbed By Chlorophyll ADP NADP Calvin Cycle Chloroplast Used Energy and is recycled. O2 + C6H12O6 Light Reaction Dark Reaction

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