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Photosynthesis Organisms make food using light energy many kinds of organisms carry out photosynthesis Multicellular plants bacteria Blue-green algae Plants provide food for animals, and us, too Photosynthesis • • • • Needs co2 & h2o Needs light energy Makes sugar Makes o2 leaf Photosynthesis equation 6CO2 + 6H2O C6H12O6 + 6O2 Complex carbohydrates, proteins, fats, amino acids, enzymes, coenzymes, pigments Light Energy – The the part we can see and the plants use! PLANT PIGMENTS ABSORB CERTAIN WAVELENGTHS OF THE VISIBLE SPECTRUM (SUNLIGHT) Chlorophyll b Chlorophyll a Beta-carotene phycoerythrin phycocyanin Plants are green because they reflect the green wavelengths and absorb (and use) the others. • Your favorite blue shirt is blue because it reflects blue wavelengths and absorbs the other wavelengths …. • Plants reflect green wavelengths. The leaf is the primary photosynthetic organ of the plant Leaves take in CO2 while roots take in H2O Chloroplasts are found in the cells of the leaf and other photosynthetic parts of the plant Green plant cells contain chloroplasts Photosynthesis occurs as long as light is available Photosynthesis occurs all day Photosynthesis and respiration are interdependent upon each other – plants carry out both processes goodnight All organisms need energy Why do we need energy? To Grow To Move To Reproduce ETC. Respiration provides energy from food • Aerobic respiration requires oxygen • Anaerobic respiration does not require oxygen Aerobic Respiration Equation C6H12O6 + 6O2 Glucose + oxygen 6CO2 + 6H2O + ATP carbon dioxide + water + ATP Respiration occurs in the Mitochondria of Cells Aerobic Respiration has three major steps • 1 • 2 34-36 ATP • 3 Respiration provides Energy from food so we can: The end