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TRANSCRIPT
REACTIONS of PHOTOSYNTHESIS
http://vilenski.org/science/safari/cellstructure/chloroplasts.html
http://www.science.siu.edu/plant-biology/PLB117/JPEGs%20CD/0076.JPG
Law of Thermodynamics*energy cannot be created nor destroyed
BUT it can change forms.
Photosynthesis converts solar energy intochemical energy.
Who and Where?
• Photosynthesis occurs in the chloroplast.
• All organisms with chloroplasts can conduct photosynthesis.
Chemical Equation
Raw Materials ProductsCO2 – from animals C6H12O6 – glucose/foodH2O – water absorbed O2 – oxygen gas used byChlorophyll –plant pigment animals
Reactions of Photosynthesis
• There are two reactions involved:1. Light Reactions –
* Must have light.
* Purpose – to capture light
energy.
2. Dark Reactions –
* Don’t need light.
* Purpose – to make glucose.
Visible light is made up of many different_______________of light
Your eyes “see”different sizes ofwaves as different ___________
http://www.simontucket.com/_Portfolio/PortLarge/L_Il_Prism.jpg
wavelengths
colors
Light Energy
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
REFLECTED
COLOR
This book “looks BLUE” because the dye in this cover _______________ of the wavelengths of light _________ blue.
_______ light is ____________ to your eyes and itlooks BLUE
http://www.michaelhyatt.com/fromwhereisit/bluebook.jpg
exceptabsorbs ALL
BLUEreflected
The dye in this T shirt absorbs all of thecolors __________________________
Red wavelengths are_________________ to your eyes and theshirt looks RED
http://jacksbear.com/shop/index.php?main_page=product_info&products_id=9
except red
reflectedGO CATS!
Objects “look BLACK” because blackdye ________________ of thewavelengths of light.
When wavelengths are absorbed so is the_____________ of the wave.
That is why wearing a blackT-shirt in the summer feelswarmer than wearing a white t-shirt.
http://www.eventsonline.ca/events/vowsa/black_shirt.jpg
http://www.hotstuffspas.com/pools_files/sunanim.gif
absorbs ALL
ENERGY
The dye in white objects _____________ of the wavelengths of light.
_______ energy is ABSORBED so wearing whiteclothing is “cooler”.
REFLECTS ALL
LITTLE
http://www.hotstuffspas.com/pools_files/sunanim.gifhttp://www.12stitch.com/shop/images/options/Blank-White-Shirt.jpg
The main energy absorbing moleculein green plants is___________________
_________________ are plant pigments too.(These look yellow, orange, and red)
CAROTENOIDS
http://www.russianflora.com/store/images/product/custom_green_plant_35.jpg
http://www.rnzih.org.nz/images/gardenimages/carrots_d.jpg
CHLOROPHYLL
GREEN leaves have BOTH chlorophyll AND carotenoids __________________but the huge amount of chlorophyll ______the other colors and leaves usually look green
ALL THE TIME
hides
In ______, chlorophyll production slows as the trees shut down and photosynthesis stops for winter.
FALL
http://sps.k12.ar.us/massengale/ecology_notes_bi.htm
Then we can see thecarotinoid colors that are usually _______ by chlorophyll
http://www.litzsinger.org/weblog/archives/email%20AutumnTrees5%20LREC%20102605.jpg
HIDDEN
red
Chlorophyll a
Chlorophyll b
Absorption of Light byChlorophyll 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
red
Chlorophyll a
Chlorophyll b
Absorption of Light byChlorophyll a and Chlorophyll b
© Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved.
There are two types of chlorophyll__________________ & ___________________
Chlorophyll babsorbs some ______light and even more_________ light.
Chlorophyll a Chlorophyll b
red
Blue-violet
red
Chlorophyll a
Chlorophyll b
Absorption of Light byChlorophyll 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
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
REFLECTS
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
Chlorophyll a
Chlorophyll b
Absorption of Light byChlorophyll a and Chlorophyll b
© Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved.
SO WHAT WAVELENGTHS ARE BEST FOR PHOTOSYNTHESIS?
THE ONESCHLOROPHYLLABSORBS THE BEST________ and_______________
red
Blue-violet
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
ENERGY & ELECTRONS
When chlorophyll absorbs light, the energy is transferredto electrons in the chlorophyll molecule.These electrons makeATP.
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
Some electrons escape and energy is lost.
Luckily, another energy molecule can bemade, NADPH, by splitting the H2O.
The plant keeps the hydrogen and releasesthe oxygen as a wasteproduct.
Oxygen bubbles
Summary, light reactions.
Used – H2O, light, chlorophyll, Produced – Energy (ATP & NADPH), O2.
Purpose – to create usable energy to fuel the dark reactions.