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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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 _____________________________

Regents Biology
How do plants make energy & food?
 Plants use the energy from the sun
_____________________________
 _____________________________

 glucose, sucrose, cellulose, starch, & more
sun
ATP
sugars
Regents Biology
Building plants from sunlight & air
 Photosynthesis

2 separate processes

_______________________
sun
 collect sun energy
 use it to make ATP

ATP
_______________________
 take the ATP energy
 collect CO2 from air &
H2O from ground
 use all to build sugars
carbon dioxide
water
+ HO
CO
Regents Biology
2
2
H2O
+
CO2
sugars
C6H12O6
sugars
Using light & air to grow plants
 ______________________________________

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
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
______________________________________

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
______________________________________
 ______________________
(ATP) = used to build the sugar
carbon
sun
+ water + energy  glucose + oxygen
dioxide
6CO2 + 6H2O + sun  C6H12O6 + 6O2
energy
Regents Biology
What do plants need to grow?
 The “factory” for making
energy & sugars

__________________ sun
 Fuels
CO2
__________________
 __________________
 __________________
Make ATP!
Make sugar!
I can do it all…
And no one
even notices!

 The Helpers

H2O
__________________
Regents Biology
ATP
enzymes
sugars
Photosynthesis
sun
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_______
ATP
ADP
_______
_______
_______
H2O
Regents Biology
CO2
used immediately
to synthesize sugars
sugar
Chloroplasts are only in plants
animal cells
plant cells
Regents Biology
Chloroplasts
Leaf
Leaves
_____________
_____________
sun
CO2
Chloroplasts
in cell
Chloroplast
Chloroplasts
contain
Chlorophyll
Regents Biology
_______________
_____________
_____________
So what does a plant need?
 Bring In
___________ leaves
 ___________
 ___________

 Let Out

___________
 Move Around

shoot
___________
roots
6CO2 + 6H2O + light  C6H12O6 + 6O2
Regents Biology
energy
Leaf Structure
_______________________
___________
____________
________
________
________
________
________
Regents Biology
_______
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xylem (water)
Transpiration
O2
 ____________
 ____________
 ____________
 so itBiology
gets
Regents
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
Regents Biology
Function of Leaf Structures
 Cuticle

________________________________________
 Epidermis

________________________________________
 Palisades layer

________________________________________
 ________________________________________

________________________________________
 ________________________________________
 Spongy layer

________________________________________
 ________________________________________
 ________________________________________
Regents Biology
Stomates & Guard Cells
 __________________________________



______________________________
______________________________
______________________________
 gets to leaves for photosynthesis
 __________________________________

______________________________
guard cell
stomate
Regents Biology
Guard cells & Homeostasis
 Homeostasis

keeping the internal
environment of the
plant balanced
 ________________________

________________________
 ________________________

________________________
 ________________________
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________________________
 ________________________
 ________________________

________________________
Regents Biology
Xylem
______________________
Regents Biology
Phloem: food-conducting cells
Regents Biology
 ____________________
____________________
____________________
 __________________
 __________________
 __________________
How are they connected?
________________
glucose + oxygen  carbon + water + energy
dioxide
C6H12O6 +
6O2
 6CO2 + 6H2O + ATP
_________________
carbon
sun
+ water + energy  glucose + oxygen
dioxide
6CO2 + 6H2O + light  C6H12O6 + 6O2
energy
Regents Biology
Energy cycle
sun
Cellular Respiration
____________________
CO2
O2
H2O
____________________
Cellular Respiration
The Great Circle
of Life!
Where’s Mufasa?
Regents Biology
ATP
Energy cycle
capture
light energy
Cellular Respiration
synthesis
____________________
CO2
__________
__________ O2
H2O
_______ _______
_______
____________________
_______
digestion
Cellular Respiration
Regents Biology
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