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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. Chlorophylls – the major energy absorbers Accessory pigments help absorb energy – they send what they absorb to chlorophyll a 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 Leaf Cross section This is what happens in photosynthesis Light reactions ` Calvin cycle Two steps of photosynthesis 1 2 Light Reactions air Calvin cycle Light reactions 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