1. Goals for Today…
I will be able to build the foundation for of the process of photosynthesis by understanding the role of light and chlorophyll
I will be able to describe the structure of chloroplast and identify where they are found

2. Where does photosynthesis occur?
Be more specific than “plants”

3. How the Leaf Does it…

4. Internal Parts Epidermis
Skin or barrier to prevent injury to leaf cells
Palisade Cells
Cells primarily responsible for photosynthesis
Spongy Mesophyll
Adds structure to leaf
Stomata
Pores allowing the plant to breath
Stomata are used to cool the plant through the process of transpiration

5. Solar Panels
Leaves collect sun energy using chlorophyll found in plant cell organelles (chloroplasts)

6. Food Storage
Glucose produced during photosynthesis is stored in plant parts as an energy source to be available when needed.
In the leaf, glucose is converted to cellulose and stored in leaf cells

7. What is the overall equation for photosynthesis?
6CO2 + 6H2O  C6H12O6 + 6O2

8. Light-Dependent Reactions (thylakoids)
H2O
Light-Dependent Reactions (thylakoids) O2
ADP NADP+
ATP NADPH
Photosynthesis is a series of reactions that uses light energy from the sun to convert water and carbon dioxide into sugars and oxygen.
CO2 + H20
Sugar
Calvin Cycle (stroma)
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9. What is the role of light and chlorophyll in photosynthesis?

10. Light and Pigments How do plants capture the energy of sunlight
In addition to water and carbon dioxide photosynthesis requires light and photosynthesis

11. Plant Pigments Main pigment found in plants is called chlorphyll
Two types:
Chlorophyll a
Chlorophyll b

12. Look at the following graph. What light is well absorbed?
Chlorophyll a absorbs violet and red light well
Chlorophyll b absorbs blue and red light

13. Look at the following graph. What light is not absorbed?
Chlorophyll a absorbs violet and red light well
Chlorophyll b absorbs blue and red light
Green light is not absorbed which is why plants look green

14. Inside a Chloroplast
In plants, photosynthesis takes place inside chloroplast

15. Inside a Chloroplast
Chloroplasts contain thylakoids—saclike photosynthetic membranes.
Chloroplast
Single
thylakoid
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16. Inside a Chloroplast
Thylakoids are arranged in stacks known as grana. A singular stack is called a granum.
Granum
Chloroplast
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17. Inside a Chloroplast
Proteins in the thylakoid membrane organize chlorophyll and other pigments into clusters called photosystems, which are the light-collecting units of the chloroplast.
Chloroplast
Photosystems
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18. Photosynthesis Overview
Light is a form of energy  any compound that absorbs light absorbs the energy from that light
When chlorophyll absorbs light, energy is transferred directly to electrons which raises the energy levels of the electrons
High-energy electrons are what make photosynthesis work