1. Photosynthesis Turning Light into Life

2. What is Photosynthesis? Autotrophs convert Sunlight  Sunlight  to Chemical Energy

3. Plants provide Chemical energy on which all life depends Oxygen – plants created our atmosphere Materials – shelter, clothing, medicine Food – for (almost) all other life form

4. All the catching of facts is done for you All the catching of facts is done for you All the breaking down of complex information is done for you All the breaking down of complex information is done for you All the digesting of difficult chemical formulas is done for you All the digesting of difficult chemical formulas is done for you All you have to do is swallow it! All you have to do is swallow it! Photosynthesis the easy way

5. CO 2 + H 2 O  C 6 H 12 O 6 + O 2  Materials Required for Photosynthesis:  Sunlight – provides energy  Carbon Dioxide – provides carbon  Water – provides electrons  & enzymes to put everything together!   Oxygen is a “waste product” after electrons have been removed from water

6. Where does photosynthesis take place? http://extension.oregonstate.edu/mg/botany/images/fig12a-small.gif

7. Leaf Structures Cuticle & epidermis protect plant Cuticle & epidermis protect plant Stomates allow gases in and out Stomates allow gases in and out Veins in leaf transport water, nutrients Veins in leaf transport water, nutrients Xylem - water & minerals up from roots Phloem - food from leaves to plant

8. Leaf Structures Mesophyll = middle leaf Mesophyll = middle leaf Palisade layer is where most photosynthesis takes place Palisade layer is where most photosynthesis takes place Cells have many chloroplasts Cells have many chloroplasts Spongy mesophyll allows gases to circulate Spongy mesophyll allows gases to circulate

9. Chloroplasts are organelles within plant cells with liquid (stroma) and stacks of membranes (grana)

10. Thylakoids – membranes that form grana

11. Photosystems Clusters of chlorophyll molecules in thylakoids that absorb light energy Clusters of chlorophyll molecules in thylakoids that absorb light energy http://kvhs.nbed.nb.ca/gallant/biology/thylakoid.jpg http://kvhs.nbed.nb.ca/gallant/biology/thylakoid.jpg

12. Narrate this movie! Narrate this movie! Narrate this movie! Narrate this movie!

13. Pigments and Color Chlorophyll a – most important pigment in photosynthesis Chlorophyll a – most important pigment in photosynthesis Other pigments are also present Other pigments are also present

14. Chlorophyll a Chlorophyll a absorbs blue & red light Chlorophyll a absorbs blue & red light Chlorophyll a reflects green/yellow light Chlorophyll a reflects green/yellow light That’s why leaves look green ! That’s why leaves look green !

15. Light Reactions - the Basics Light Reactions - the Basics Light Reactions - the Basics Light Reactions - the Basics