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PHOTOSYNTHESIS! From the Greek language. Means “ using light to put something together.” PHOTOSYNTHESIS Current definition: Process occurring in the chloroplast that converts light energy, water and carbon dioxide into glucose (energy-rich carb) and oxygen. WHERE IN THE PLANT CELL DOES PHOTOSYNTHESIS TAKE PLACE? Photosynthesis occurs in the chloroplasts of leaves, and requires light-absorbing pigments called Chlorophyll a and Chlorophyll b. Typically, other plant parts do not photosynthesize. WORD EQUATION FOR PHOTOSYNTHESIS Light Carbon dioxide + water Oxygen + Glucose Glucose is a sugar that stores energy in the plant. CHEMICAL EQUATION FOR PHOTOSYNTHESIS Light 6CO2 + 6H20 6O2 + C6H12O6 glucose Photosynthesis Plants are green due to the green chloroplasts inside them which contain chlorophyll (pigment). Plant –like photosynthesizers Some fungi All Blue-green bacteria Non-animals that do not photosynthesize : Fungi (mushrooms) Strep bacteria (most do not anyway) Chemosynthetic plants What it actually looks like… Taken with a TEM (Transmission Electron Microscope) See page ____ for diagram. Two overall steps… Light Reactions Dark Reactions Chlorophyll in chloroplasts Also called the “Calvin receive light energy, and electrons ‘jump’ right out of the molecule. These electrons are passed along an electron transport chain to power ATP synthase. One by-product is O2 cycle” after Melvin Calvin Uses the ATP just produced and CO2 to make C6H12O6 (glucose) The Light Reactions Deep inside the chloroplast, on the thylakoid membrane Makes ATP! O2 is a byproduct The Dark Reactions A little less deep in the chloroplast Uses ATP and CO2 to make C6H12O6 (glucose) Cellular Respiration Definition: The process of breaking down glucose to useable energy (ATP). ALL cells in organisms undergo cellular respiration!!! Chemical equation for this process C6H12O6 + 6O2 ----> 6CO2 + 6H2O + 36 ATP Glucose + Oxygen yields carbon dioxide + water + ATP (energy) Comparing Photosynthesis and Cellular Respiration Photosynthesis Function Location Reactants Products Cellular Resp.