Presentation on theme: "REACTIONS of PHOTOSYNTHESIS 8-2"— Presentation transcript:
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
Research into PHOTOSYNTHESIS began centuries ago with this simple question: When a tiny seed grows into a huge plant, where does all the “new plant” come from? http://www.nofretete-page.de/gemischtNeu/TN_plant_grow_w.JPG
EXPERIMENTS TO FIND OUT Then he planted the seedling in the pot and watered it regularly. At the end of 5 years the _____________ __________about 75 kg, but the mass of the _________ was almost ________________. http://www2.nsta.org/Energy/find/primer/primer2_3.html He decided the “increase in plant” had to come from the ________… that was the only thing he had added! In 1643- a Belgian physician ___________________ determined the mass of a pot of dry soil and a small seedling.
EXPERIMENTS TO FIND OUT Plants use _______ and ______ dioxide to make ___________________ http://www2.nsta.org/Energy/find/primer/primer2_3.html Van Helmont didn’t realize the major contribution to the mass of his tree was something he couldn’t see… __________________ from the air.
EXPERIMENTS TO FIND OUT 1771- An English minister, _________________________, discovered that a flame burning in a closed jar would die out. If he placed a __________ in the jar and allowed a few days to pass, the candle could be lit again. The plant produced something “required for burning” that the candle used up http://www2.nsta.org/Energy/find/primer/primer2_7.html http://www2.nsta.org/Energy/find/primer/primer2_8.html We now know it was …____________
EXPERIMENTS TO FIND OUT 1779- Dutch scientist ________________________ showed Priestley’s plant experiment only worked if the plant was exposed to _________________ ! http://www.rgg.og.schule-bw.de/Dokus/d-faech/Biologie/Klasse%208/Bilder/Fotosynthese/Ingenhousz-Netz.JPG
EXPERIMENTS TO FIND OUT 1961- American chemist ________________________ received the Nobel prize for figuring out the chemical _______________ used by plants to make sugar http://www.bookrags.com/Melvin_Calvin http://www.daviddarling.info/encyclopedia/C/Calvincycle.html
THE BIG PICTURE These experiments led to work by later scientists who finally discovered that in the presence of light, plants transform CO 2 and water into carbohydrates and release oxygen. _____________ + ____________ _______________ + ____________ →
In addition to water and carbon dioxide, __________________ and __________________ are needed for photosynthesis to happen. http://fig.cox.miami.edu/~cmallery/255/255phts/255phts.htm
____________________ involves a complex series of chemical reactions, in which the product of one reaction is _____________ by the next reaction. Reaction 1 →Product → X Reaction 2 → Product Y A series of reactions linked in this way is referred to as a __________________________
Visible light is made up of many different _______________of light Your eyes “see” different sizes of waves as different ___________ http://www.simontucket.com/_Portfolio/PortLarge/L_Il_Prism.jpg
Many people think that plants are green because they absorb and use green light in photosynthesis, BUT.... Myth: Image from: http://oogletutorials.com/wp-content/uploads/2007/12/photoshop-lesson-green-leaf-design26.gif
BUT… We “see” reflected light Light wavelengths that are ___________ off of objects bounce back to our eyes. That is the ___________ we “see” Image modified from: http://www.visibledreams.net/Web/color/color_3.html
This book “looks BLUE” because the dye in this cover _______________ of the wavelengths of light _________ blue. _______ light is ____________ to your eyes and it looks BLUE http://www.michaelhyatt.com/fromwhereisit/bluebook.jpg
The dye in this T shirt absorbs all of the colors __________________________ Red wavelengths are _________________ to your eyes and the shirt looks RED http://jacksbear.com/shop/index.php?main_page=product_info&products_id=9 GO CATS!
Objects “look BLACK” because black dye ________________ of the wavelengths of light. When wavelengths are absorbed so is the_____________ of the wave. That is why wearing a black T-shirt in the summer feels warmer than wearing a white t-shirt. http://www.eventsonline.ca/events/vowsa/black_shirt.jpg http://www.hotstuffspas.com/pools_files/sunanim.gif
The dye in white objects _____________ of the wavelengths of light. ____ energy is ABSORBED so wearing white clothing is “cooler”. LITTLE http://www.hotstuffspas.com/pools_files/sunanim.gif http://www.12stitch.com/shop/images/options/Blank-White-Shirt.jpg
Which wavelengths of light are these Flowers REFLECTING? Images by: VanderWal
Image by: VanderWal Which wavelengths of light do these LEAVES reflect? So green leaves ____________ the green wavelength of light.
Plants gather the sun’s energy with light absorbing molecules called ___________. By: VanderWal
The main energy absorbing molecule in green plants is ___________________ _________________ are plant pigments too. (These look yellow, orange, and red) http://www.russianflora.com/store/images/product/custom_green_plant_35.jpg http://www.rnzih.org.nz/images/gardenimages/carrots_d.jpg
GREEN leaves have BOTH chlorophyll AND carotenoids __________________ but the huge amount of chlorophyll ______ the other colors and leaves usually look green
In ______, chlorophyll production slows as the trees shut down and photosynthesis stops for winter. http://sps.k12.ar.us/massengale/ecology_notes_bi.htm
Then we can see the carotinoid colors that are usually _______ by chlorophyll http://www.litzsinger.org/weblog/archives/email%20AutumnTrees5%20LREC%20102605.jpg
That’s why leaves LOOK GREEN….. Chlorophyll doesn’t absorb…. it ___________ GREEN light! http://www.russianflora.com/store/images/product/custom_green_plant_35.jpg
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
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 & 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!