THINK ABOUT IT How would you design a system to capture the energy of sunlight and convert it into a useful form?
Important Root Words Root Word Meaning Photo Chloro -phyll Stome Xantho
All Organisms Need Energy Notes: Cells use energy trapped in chemical bonds. When these bonds are broken, energy is released for cellular activities. When cells use several linked chemical pathways to create the energy needed, this is called a biochemical pathway.
Light Notes: Our eyes see the individual wavelengths of the visible spectrum as different colors: red, orange, yellow, green, blue, indigo, and violet.
Pigments Notes: There are two main types of chlorophyll: .
Copyright Pearson Prentice Hall Light and Pigments . 100 80 60 40 20 Chlorophyll b Estimated Absorption (%) Chlorophyll a Photosynthesis requires light and chlorophyll. In the graph above, notice how chlorophyll a absorbs light mostly in the blue-violet and red regions of the visible spectrum, whereas chlorophyll b absorbs light in the blue and red regions of the visible spectrum. Wavelength (nm) 400 450 500 550 600 650 700 750 Wavelength (nm) Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Light and Pigments 100 80 60 40 20 Chlorophyll b Chlorophyll a Estimated Absorption (%) Photosynthesis requires light and chlorophyll. In the graph above, notice how chlorophyll a absorbs light mostly in the blue-violet and red regions of the visible spectrum, whereas chlorophyll b absorbs light in the blue and red regions of the visible spectrum. 400 450 500 550 600 650 700 750 Wavelength (nm) Copyright Pearson Prentice Hall
Pigments
What’s going on here? Why do leaves turn color in the fall?
Pigments Most of the time, the green color of the chlorophyll overwhelms the other pigments, but…
Copyright Pearson Prentice Hall Inside a Chloroplast Plant Chloroplast Plant cells Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Inside a Chloroplast . Single thylakoid Chloroplast Copyright Pearson Prentice Hall
Copyright Pearson Prentice Hall Inside a Chloroplast Notes: Stroma Granum Chloroplast Copyright Pearson Prentice Hall