Announcements Start new unit Photosynthesis and cellular respiration 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 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 Soil weighed constantly 75 grams Water was the only thing he added Water was the only thing he added Joseph Priestley Observed a plant keep a flame alive underneath a glass dome Observed a plant keep a flame alive underneath a glass dome Jan Ingenhousz figured out that plants produce oxygen in light Jan Ingenhousz figured out that plants produce oxygen in lightPhotosynthesis Plants convert the energy of sunlight into the energy in the chemical bonds of carbohydrates Plants convert the energy of sunlight into the energy in the chemical bonds of carbohydrates

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 Autotrophs – organisms that can make their own source of food. Ex. Plants Heterotroph – organisms that obtain energy from another source. Ex. People 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. Chlorophyll is the primary pigment in plants. Energy storing compounds ATP (adenosine triphosphate) – power currency of the cell ATP (adenosine triphosphate) – power currency of the cell

Requirements for Photosynthesis

AdenineRibose3 Phosphate groups Section 8-1 ATP Go to Section:

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

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

“Simplified” EQUATION FOR PHOTOSYNTHESIS 6CO 2 + 6H 2 O + Energy (Light) C 6 H 12 O 6 + 6O 2 CARBON DIOXIDE WATER GLUCOSEOXYGEN

Photosynthesis H2OH2OH2OH2O CO 2 O2O2O2O2 C 6 H 12 O 6 Light Reaction Dark Reaction Light is Adsorbed By Chlorophyll Water is broken Chloroplast ATP and NADPH 2 ADP NADP Calvin Cycle Energy Used Energy and is recycled. + +