1. THINK ABOUT IT
How would you design a system to capture the energy of sunlight and convert it into a useful form?

2. Important Root Words Root Word Meaning Photo Chloro -phyll Stome
Xantho

3. 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.

4. Light
Notes:
Our eyes see the individual wavelengths of the visible spectrum as different colors: red, orange, yellow, green, blue, indigo, and violet.

5. Pigments
Notes:
There are two main types of chlorophyll: .

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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)
Wavelength (nm)
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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.
Wavelength (nm)
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8. Pigments

9. What’s going on here?
Why do leaves turn color in the fall?

10. Pigments
Most of the time, the green color of the chlorophyll overwhelms the other pigments, but…

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Inside a Chloroplast
Plant
Chloroplast
Plant cells
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Inside a Chloroplast .
Single
thylakoid
Chloroplast
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Inside a Chloroplast
Notes:
Stroma
Granum
Chloroplast
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