1. REACTIONS of PHOTOSYNTHESIS 8-2 http://vilenski.org/science/safari/cellstructure/chloroplasts.html http://www.science.siu.edu/plant-biology/PLB117/JPEGs%20CD/0076.JPG

2. THE BIG PICTURE In the presence of light, plants transform CO 2 and water into carbohydrates and release oxygen. _____________ + ____________ _______________ + ____________ Carbon dioxide WATERSugars Oxygen 6 CO 2 _____________ + ____________ _______________ + ____________ 6 H 2 OC 6 H 12 O 6 6 O 2 →

3. In addition to water and carbon dioxide, __________________ and __________________ are needed for photosynthesis to happen. chlorophyll light energy http://fig.cox.miami.edu/~cmallery/255/255phts/255phts.htm

4. ____________________ involves a complex series of chemical reactions, in which the product of one reaction is _____________ by the next reaction. Photosynthesis consumed Reaction 1 →Product → X Reaction 2 → Product Y A series of reactions linked in this way is referred to as a __________________________ biochemical pathway

5. PHOTOSYNTHESIS Light-Dependent Reaction Light-Independent Reactions Light & Water oxygen ATP NADPH Carbon Dioxide (CH 2 O) n Calvin Cycle

6. PHOTOSYNTHESIS: Reactants & Products LIGHT ENERGY 6CO 2 + 6H 2 OSUGAR + 6O 2

7. Sunlight is made up of many different _______________ of light Your eyes “see” different wavelengths as different ___________ http://www.simontucket.com/_Portfolio/PortLarge/L_Il_Prism.jpg wavelengths colors

8. Sizes of Wavelengths http://www.ology.amnh.org/einstein/lightmatterenergy/light.html

9. Plants gather the sun’s energy with light absorbing molecules called ___________. pigments By: VanderWal

10. The main energy absorbing molecule in green plants is ___________________ _________________ are pigments too. (These look yellow, orange, and brown) CAROTENOIDS http://www.russianflora.com/store/images/product/custom_green_plant_35.jpg http://www.rnzih.org.nz/images/gardenimages/carrots_d.jpg CHLOROPHYLL

11. Carotenoids are usually _______ by the presence of _______________ http://www.litzsinger.org/weblog/archives/email%20AutumnTrees5%20LREC%20102605.jpg HIDDEN chlorophyll

12. When chlorophyll ____________ in the _______, we can see the carotenoid colors that are there ____________, but are no longer hidden. DISAPPEARS FALL ALL THE TIME http://sps.k12.ar.us/massengale/ecology_notes_bi.htm

13. red Chlorophyll a Chlorophyll b Absorption of Light by Chlorophyll a and Chlorophyll b © Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved. There are two types of chlorophyll __________________ & ___________________ Chlorophyll a absorbs the _____ & ________ wavelengths best. It absorbs very little ______ light. Chlorophyll a Chlorophyll b red violet Blue

14. red Chlorophyll a Chlorophyll b Absorption of Light by Chlorophyll a and Chlorophyll b © Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved. There are two types of chlorophyll __________________ & ___________________ Chlorophyll b absorbs ______light and even more _________ light. Chlorophyll a Chlorophyll b red Blue-violet

15. red Chlorophyll a Chlorophyll b Absorption of Light by Chlorophyll a and Chlorophyll b © Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved. NEITHER KIND OF CHLOROPHYLL IS VERY GOOD AT ABSORBING _________ LIGHT! GREEN

16. That’s why plant have other pigments (like carotenoids). They help _________ some wavelengths chlorophyll _______; so the plant can __________ of the sun’s energy. http://members.aol.com/diaspore/vhouse/biology/projects/photosynthesis/woida/meaning_of_light.html#question_1 USE MORE ABSORB DOESN’T

17. Many people think that plants are green because they absorb and use green light in photosynthesis, BUT.... Myth:

18. Chlorophyll b Chlorophyll a Absorption of Light by Chlorophyll a and Chlorophyll b © Pearson Education, Inc. Publishing as Pearson Prentice-Hall. All rights reserved. REMEMBER: Chlorophyll a & b ______________ absorb _______________ wavelengths of light do NOT green

19. Why are plants green? BECAUSE… Chlorophyll _____________ light very well in the __________________ regions and _________ light in the green regions of spectrum. http://www.mhhe.com/biosci/pae/botany/uno/graphics/uno01pob/vrl/images/0160.gif absorbs blue-violet and red reflects

20. We “see” reflected light Light wavelengths that are ___________ bounce back to your eyes... so leaves “LOOK” green. Image modified from: http://www.visibledreams.net/Web/color/color_3.html ___________________________________ REFLECTED

21. When you see a plant with yellow flowers and green leaves, the plant is ____________________________ wavelengths of light reflecting yellow and green By: VanderWal

22. When you see a plant with __________ and __________ flowers, the plant is reflecting yellow and purple wavelengths of light. By: VanderWal purpleyellow

23. Plants ________________ mainly ___________________________ wavelengths of light for photosynthesis. red and blue-violet By: VanderWal absorb and use

24. Pearson Education Inc, Pusblishing as Pearson Prentice Hall Because light is a form of ___________, any molecule that absorbs light also ___________the energy from the light. ENERGY ABSORBS

25. ENERGY & ELECTRONS When chlorophyll absorbs light, the energy is transferred to electrons in the chlorophyll molecule. http://www.mhhe.com/biosci/pae/botany/uno/graphics/uno01pob/vrl/images/0160.gif http://www.wjcc.k12.va.us/ROBB/Atom%20Animation%20Resources_files/image003.gif HIGH ENERGY ____________ make photosynthesis work! ELECTRONS