by chlorophyll

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Transcript by chlorophyll

http://vilenski.org/science/safari/cellstructure/chloroplasts.html
Photosynthesis: An Overview
http://www.science.siu.edu/plant-biology/PLB117/JPEGs%20CD/0076.JPG
THE BIG PICTURE
These experiments led to work by later
scientists who finally discovered that in the
presence of light, plants transform CO2 and water
into carbohydrates and release oxygen.
Carbon
WATER
_____________
+
____________
dioxide
6 CO2 + ____________
6 H 2O
_____________
Sugars
Oxygen
_______________ + ____________
→
C6H12O6 + ____________
6 O2
_______________
In addition to water and carbon dioxide,
http://fig.cox.miami.edu/~cmallery/255/255phts/255phts.htm
chlorophyll
__________________
and
light energy
__________________
are needed for photosynthesis
to happen.
____________________
Photosynthesis involves a
complex series of chemical reactions, in
which the product of one reaction is
_____________
consumed by the next reaction.
Reaction 1 → Product → Reaction 2 → Product
Y
X
A series of reactions linked in this way is
biochemical pathway
referred to as a __________________________
PHOTOSYNTHESIS
Light &
Water
Light-Dependent
Reaction
oxygen
ATP
NADPH
Carbon
Dioxide
Light-Independent
Reactions
Calvin Cycle
(CH2O)n
PHOTOSYNTHESIS: Reactants & Products
LIGHT ENERGY
6CO2 + 6H2O
SUGAR + 6O2
http://son.nasa.gov/tass/images/cont_emspec2.jpg
http://www.ology.amnh.org/einstein/lightmatterenergy/light.html
Visible light is made up of many different
_______________of
light
wavelengths
Your eyes “see”
different sizes of
waves as different
___________
colors
http://www.simontucket.com/_Portfolio/PortLarge/L_Il_Prism.jpg
Myth:
Many people think that plants are
green because they absorb and use
green light in photosynthesis,
BUT . . . .
Image from: http://oogletutorials.com/wp-content/uploads/2007/12/photoshop-lesson-green-leaf-design26.gif
BUT… We “see” reflected light
REFLECTED
Light wavelengths that are ___________
off of objects bounce back to our eyes .
COLOR
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 _______________
absorbs ALL of the
except blue.
wavelengths of light _________
BLUE light is
_______
____________
reflected to your eyes and it
looks BLUE
http://www.michaelhyatt.com/fromwhereisit/bluebook.jpg
Objects “look BLACK” because black
absorbs ALL
dye ________________
of the
wavelengths of light.
When wavelengths are absorbed so is
ENERGY
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
_____________
REFLECTS
ALL
of the wavelengths of light.
LITTLE
____ energy is ABSORBED
so wearing white
clothing is “cooler”.
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?
Purple & yellow
Images by: VanderWal
yellow
Which wavelengths of light do
these LEAVES reflect?
green
So green leaves
____________
the
REFLECT
green wavelength
of light.
Image by: VanderWal
Plants gather the sun’s energy
with light absorbing molecules
pigments
called ___________.
By: VanderWal
http://www.russianflora.com/store/images/product/custom_green_plant_35.jpg
The main energy
absorbing molecule
in green plants is
CHLOROPHYLL
___________________
CAROTENOIDS
_________________
are plant pigments too.
(These look yellow,
orange, and red)
http://www.rnzih.org.nz/images/gardenimages/carrots_d.jpg
GREEN leaves have BOTH
chlorophyll AND
carotenoids
__________________
but the huge amount of
chlorophyll ______
hides
the other colors and
leaves usually
look green
FALL chlorophyll production
In ______,
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
HIDDEN by chlorophyll
usually _______
http://www.litzsinger.org/weblog/archives/email%20AutumnTrees5%20LREC%20102605.jpg
© Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved.
There are two types of chlorophyll
Chlorophyll a
__________________
& ___________________
Chlorophyll b
Absorption of Light by
Chlorophyll a and Chlorophyll b
Chlorophyll b
Chlorophyll a
absorbs the
violet
_____
red & ________
wavelengths best.
Chlorophyll a
red It absorbs very
Blue light.
little ______
© Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved.
There are two types of chlorophyll
Chlorophyll a
__________________
& ___________________
Chlorophyll b
Absorption of Light by
Chlorophyll a and Chlorophyll b
Chlorophyll b
absorbs some
______light
and
red
even more
_________
Blue-violet light.
Chlorophyll b
Chlorophyll a
red
© Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved.
Absorption of Light by
Chlorophyll a and Chlorophyll b
Chlorophyll b
Chlorophyll a
red
NEITHER KIND OF
CHLOROPHYLL IS
VERY GOOD AT
ABSORBING
GREEN LIGHT!
_________
http://www.russianflora.com/store/images/product/custom_green_plant_35.jpg
That’s why leaves LOOK
GREEN…..
Chlorophyll doesn’t absorb….
it ___________
REFLECTS GREEN light!
That’s why plant have other pigments
ABSORB
(like carotenoids). They help _________
some wavelengths chlorophyll DOESN’T
_______;
USE MORE of the
so the plant can __________
sun’s energy.
http://members.aol.com/diaspore/vhouse/biology/projects/photosynthesis/woida/meaning_of_light.html#question_1
© Pearson Education, Inc. Publishing asPearson Prentice-Hall. All rights reserved.
SO WHAT WAVELENGTHS ARE
BEST FOR PHOTOSYNTHESIS?
Absorption of Light by
Chlorophyll a and Chlorophyll b
Chlorophyll b
Chlorophyll a
THE ONES
CHLOROPHYLL
ABSORBS
THE BEST
red
________
and
_______________
Blue-violet
Pearson Education Inc, Pusblishing as Pearson Prentice Hall
Because light is a
form of ___________,
ENERGY
any molecule that
absorbs light also
ABSORBS
___________the
energy from the light.
ENERGY & ELECTRONS
http://www.mhhe.com/biosci/pae/botany/uno/graphics/uno01pob/vrl/images/0160.gif
When chlorophyll
absorbs light, the
energy is transferred
to electrons in the
chlorophyll molecule.
ELECTRONS
HIGH ENERGY ____________
make photosynthesis work!
http://www.wjcc.k12.va.us/ROBB/Atom%20Animation%20Resources_files/image003.gif