Upload
ackademic
View
583
Download
1
Embed Size (px)
Citation preview
Regents Biology 2006-2007
Regents Biology 2006-2007
Photosynthesis:Life from Light and Air
Regents Biology
Plants are energy producers Like animals, plants need energy to live Unlike animals, plants don’t need to eat
food to make that energy Plants make both food & energy
animals are consumers plants are producers
Regents Biology
How do plants make energy & food? Plants use the energy from the sun
to make ATP energy to make sugars
glucose, sucrose, cellulose, starch, & more
sun
ATP
sugars
Regents Biology
H2O
Building plants from sunlight & air Photosynthesis
2 separate processes energy building reactions
collect sun energy use it to make ATP
sugar building reactions take the ATP energy collect CO2 from air &
H2O from ground use all to build sugars
ATP
sun
sugars
+
carbon dioxideCO2
sugarsC6H12O6
CO2
waterH2O
+
Regents Biology
Using light & air to grow plants
6CO2 6H2O C6H12O6 6O2sun
energy+ ++
glucose + oxygencarbondioxide
sunenergy+ water +
(ATP)
Photosynthesis using sun energy to make ATP using carbon dioxide & water to make sugar in chloroplast allows plants to grows makes a waste product
oxygen
Regents Biology
What do plants need to grow? The “factory” for making
energy & sugars chloroplast
Fuels sunlight carbon dioxide water
The Helpers enzymes H2O
sugars
ATP
Make ATP!Make sugar!
I can do it all…And no one
even notices!
enzymes
CO2
sun
Regents Biology
Photosynthesis
energybuilding reactions
sugarbuilding reactions
ATPADP
CO2sugar
sun
Regents Biology
Chloroplasts are only in plants
animal cellsanimal cells plant cellsplant cells
Regents Biology
CO2
Chloroplasts
Chloroplastsin cell
LeafLeaf
Chloroplast
absorbsunlight & CO2
makeenergy & sugar
Chloroplastscontain
Chlorophyll
Regents Biology
Bring In CO2
H2O light
Let Out O2
Move Around sugars
So what does a plant need?
6CO2 6H2O C6H12O6 6O2light
energy + ++
roots
shoot
leaves
Regents Biology
Leaf Structure
phloem (sugar)xylem (water)
stomate guardcell
palisadeslayer
spongylayer
cuticleepidermis
Regents Biology
Transpiration
H2O CO2
CO2
O2 H2O
xylem (water)
stomate guardcell gases in & out
water out O2
Regents Biology
Transpiration Water evaporates
from the stomates in the leaves water molecules
stick to each other
more water is pulled up the tree
Regents Biology
Stomates Function of stomates
CO2 in
O2 out
H2O out
guard cell
stomate
Regents Biology
Regents Biology
Xylemcarry water up from roots
Regents Biology
Phloem: food-conducting cells
carry sugars around the plant wherever they are needed new leavesfruit & seedsroots
Regents Biology
Putting it all together Making a living…
sunlight leaves = solar collectors photosynthesis
gases: CO2 in & O2 out stomates = gases in & out
H2O roots take in water from soil pulled up by leaf evaporation
nutrients roots take in from soil
Regents Biology
How are they connected?
glucose + oxygen carbon + water + energydioxide
C6H12O6 6O2 6CO2 6H2O ATP+ + +
Respiration
Photosynthesis
6CO2 6H2O C6H12O6 6O2light
energy + ++
glucose + oxygencarbondioxide
sunenergy+ water +
Regents Biology
H2O
Energy cycle
Photosynthesis
Cellular Respiration
sun
The Great Circleof Life!
Where’s Mufasa?
glucose O2CO2
plants
animals, plants
ATP
Regents Biology
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
Then all the cats, dogs, mice, people & elephants…
are really strands of air woven together by sunlight!
sunair
Regents Biology 2006-2007
Got the energy…
Ask Questions!!
Regents Biology
Energy needs of life All life needs a constant input of energy
Animals = Heterotrophs get their energy from “eating others”
eat food = other organisms = organic molecules
make energy through respiration Plants = Autotrophs
get their energy from “self”get their energy from sunlightbuild organic molecules (food) from CO2
make energy through photosynthesis
Regents Biology
How do plants live? Photosynthesis
Energy building reactions collect sun energy make ATP
Sugar building reactions use ATP for energy use CO2 as carbon for new sugars
build sugars glucose, cellulose, starch
build all other organic molecules proteins, lipids, carbohydrates, DNA
store energy for future use starch in seeds & roots
Regents Biology
Regents Biology
Photosynthesis
This is the equation you are used to seeing, but this is not the whole story…
+ water + energy glucose + oxygencarbondioxide
6CO2 6H2O C6H12O6 6O2light
energy+ ++