1. Warm Up Monday November 19th List 5 common household items that you use everyday that come from plants.

2. PHOTOSYNTHESIS

3. The Sun the ultimate source of all energy for all life on Earth

4. Autotrophs Vs. Heterotrophs An autotroph is an organism that feeds itself! (produces its own food!) A heterotroph is an organism that feeds on another organism (cannot produce own food!) Can you think of an example of each? Poison SumacLions (and Zebras for that matter!)

5. Autotroph or Heterotroph?

10. Photoautotrophs Photo = Light Auto = Self Troph = Feed Plants are “photoautotrophs” because they feed themselves with light.

11. PHOTOSYNTHESIS … is the conversion of light energy into chemical energy by living organisms Prickly Pear CactusCedar Tree

12. Why should I care about photosynthesis? More than 200 years ago, Priestly stumbled upon the answer! Who? Me? NO! ME!!!

13. Joseph Priestly 1733-1804

14. Photosynthesis overview

15. What Light is Available for Plants to use? Light acts as both a particle (photon) and a wave! The different lengths of light waves create the spectrum of colors we can see! Red = LONG waves Violet = SHORT waves

16. How do plants absorb light? Pigments in the chloroplast absorb a variety of light energy wavelengths. Examples: Chlorophyll A & B Xanthophyll Carotenoids

17. Chlorophyll a  Found in all plants, algae and cyanobacteria.  Makes photosynthesis possible.  Participates directly in light reactions  Can accept energy from chlorophyll b

18. Chlorophyll b  Is an accessory pigment  Chlorophyll b acts indirectly in photosynthesis by transferring the light it absorbs to chlorophyll a

19. Plant Pigments Seen w/ Paper Chromatography

20. Absorption Spectrum Plants only absorb violet and red light, and reflect green light, which is why plants appear green!

21. Where does Photosynthesis happen? In Chloroplasts!

22. What’s in a Chloroplast? Photosynthesis takes place within the thylakoid membranes!

24. Light Reactions

25. First step in photosynthesis where light energy is converted to chemical energy. Light energy is used to break apart H 2 O into H 2 & O 2.

26. The H + ions and the free electrons that result from breaking apart water make high energy molecules! ATP & NADPH Light Reactions

27. The Calvin Cycle A set of reactions that turn CO 2 into Carbon assembled into glucose. CO 2  Sugars The Calvin Cycle requires energy from ATP & NADPH made by Light Reactions! aka “Dark Reactions” b/c doesn’t need light

28. Dark Reactions (calvin cycle) Chemical reactions that convert CO 2 and other compounds into Glucose! Doesn’t require light energy. Takes place in the space outside the thylakoid membrane.

29. Photosynthesis