Transcript 16photosynthesis2009..

Photosynthesis:
Life from Light and Air
Regents Biology
2008-2009
Plants are energy producers
 Like animals, plants need energy to live
 Unlike animals, plants don’t need to eat

food to make that energy
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How do plants make energy & food?
 Plants use the energy from the sun
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 _____________________________
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 glucose, sucrose, cellulose, starch, & more
sun
ATP
sugars
Regents Biology
Building plants from sunlight & air
 Photosynthesis

2 separate processes
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sun
 collect sun energy
 use it to make ATP

ATP
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 take the ATP energy
 collect CO2 from air &
H2O from ground
 use all to build sugars
carbon dioxide
water
+ HO
CO
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2
2
H2O
+
CO2
sugars
C6H12O6
sugars
Using light & air to grow plants
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(ATP) = used to build the sugar
carbon
sun
+ water + energy  glucose + oxygen
dioxide
6CO2 + 6H2O + sun  C6H12O6 + 6O2
energy
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What do plants need to grow?
 The “factory” for making
energy & sugars

__________________ sun
 Fuels
CO2
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 __________________
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Make ATP!
Make sugar!
I can do it all…
And no one
even notices!
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 The Helpers

H2O
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ATP
enzymes
sugars
Photosynthesis
sun
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ATP
ADP
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H2O
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CO2
used immediately
to synthesize sugars
sugar
Chloroplasts are only in plants
animal cells
plant cells
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Chloroplasts
Leaf
Leaves
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sun
CO2
Chloroplasts
in cell
Chloroplast
Chloroplasts
contain
Chlorophyll
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So what does a plant need?
 Bring In
___________ leaves
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 ___________
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 Let Out

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 Move Around

shoot
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roots
6CO2 + 6H2O + light  C6H12O6 + 6O2
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energy
Leaf Structure
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xylem (water)
Transpiration
O2
 ____________
 ____________
 ____________
 so itBiology
gets
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O
C
stomate
O2
H
to leaves from roots
C
guard
cells
Transpiration
 Water evaporates from
the stomates in the
leaves

pulls water up from
roots
 water molecules stick
to each other

more water is pulled
up tree from ground
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Function of Leaf Structures
 Cuticle

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 Epidermis

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 Palisades layer

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 Spongy layer

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Stomates & Guard Cells
 __________________________________
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 gets to leaves for photosynthesis
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guard cell
stomate
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Guard cells & Homeostasis
 Homeostasis

keeping the internal
environment of the
plant balanced
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Xylem
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Phloem: food-conducting cells
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 ____________________
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____________________
 __________________
 __________________
 __________________
How are they connected?
________________
glucose + oxygen  carbon + water + energy
dioxide
C6H12O6 +
6O2
 6CO2 + 6H2O + ATP
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carbon
sun
+ water + energy  glucose + oxygen
dioxide
6CO2 + 6H2O + light  C6H12O6 + 6O2
energy
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Energy cycle
sun
Cellular Respiration
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CO2
O2
H2O
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Cellular Respiration
The Great Circle
of Life!
Where’s Mufasa?
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ATP
Energy cycle
capture
light energy
Cellular Respiration
synthesis
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CO2
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__________ O2
H2O
_______ _______
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digestion
Cellular Respiration
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release
chemical energy
ATP
The poetic perspective
 All of the solid material of every plant
was built out of thin air
 All of the solid material of every animal
was built from plant material
air
Regents Biology
Then all the cats, dogs,
mice, people & elephants…
are really strands of air woven
together by sunlight!
sun
Got the energy…
Ask Questions!!
Regents Biology
2008-2009