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Transcript
Question: Where does photosynthesis take place? 1 Plants • Autotrophs – produce their own food (glucose) • Process called photosynthesis • Mainly occurs in the leaves: a. stoma - pores b.mesophyll cells Mesophyll Cell Chloroplast Stoma 2 Stomata (stoma) Pores in a plant’s cuticle through which water vapor and gases (CO2 & O2) are exchanged between the plant and the atmosphere. Stoma Carbon Dioxide (CO2) Guard Cell Oxygen (O2) Guard Cell Found on the underside of leaves 3 Mesophyll Cell of Leaf Nucleus Cell Wall Chloroplast Central Vacuole Photosynthesis occurs in these cells! 4 Chloroplast Organelle where photosynthesis takes place. Stroma Outer Membrane Inner Membrane Thylakoid Granum Thylakoid stacks are connected together 5 Thylakoid Thylakoid Membrane Granum Thylakoid Space Grana make up the inner membrane 6 Question: Why are plants green? 7 Chlorophyll Molecules • Located in the thylakoid membranes • Chlorophyll have Mg+ in the center • Chlorophyll pigments harvest energy (photons) by absorbing certain wavelengths (blue-420 nm and red660 nm are most important) • Plants are green because the green wavelength is reflected, not absorbed. 8 9 Wavelength of Light (nm) 400 500 600 700 Short wave Long wave (more energy) (less energy) 10 Absorption of Light by Chlorophyll Chlorophyll absorbs blue-violet & red light best Absorption violet blue green yellow wavelength orange red 11 Question: During the fall, what causes the leaves to change colors? 12 Fall Colors • In addition to the chlorophyll pigments, there are other pigments present • During the fall, the green chlorophyll pigments are greatly reduced revealing the other pigments • Carotenoids are pigments that are either red, orange, or yellow 13 Chloroplast Outer Membrane Inner Membrane STROMA– where Calvin Cycle occurs Thylakoid Granum 14