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PhotosynthesisPhotosynthesis
andand
Cellular Cellular RespirationRespiration
• All living things depend on energy
•ATP is used by all cells as their basic energy source
• Where does this ATP come from?
Where does Energy (ATP) come from?
Photosynthesis Cellular Respiration (aerobic)
What is it for?
Who does it?
Formula
Organelle
Reactions/location
Reactants
Products
If NO oxygen is present, then…
Autotrophs
use light energy from sun to produce food (sugars)
Heterotrophs
obtain energy from the food they consume
PhotosynthesisPhotosynthesis
6CO2 + 6H2O C6H12O6 + 6O2
Cellular Respiration
PhotosynthesisPhotosynthesis
6CO2 + 6H2O C6H12O6 + 6O2
glucoseglucose
SUN
Question:Question:
• Where does photosynthesis take place?Where does photosynthesis take place?
Plant LeafPlant Leaf
Cell Wall
Nucleus
ChloroplastChloroplast
Central Vacuole
ChloroplastChloroplast• OrganelleOrganelle where photosynthesisphotosynthesis takes place.
GranumThylakoidStroma
Two Parts to Photosynthesis
Two main parts of PhotosynthesisTwo main parts of Photosynthesis
Calvin Cycle Calvin Cycle akaLight Independent RxnLight Independent Rxn
• Occurs in the stroma
• Uses the ATP and NADPH
• Converts CO2 to glucose
Light Dependent RxnLight Dependent Rxn
• Occurs in the thylakoids
• Captures energyenergy from sunsun as ATPATP
NADPHNADPH
• Produces OO22
ThylakoidThylakoid
Granum
Has pigment chlorophyllchlorophyll – absorbs light
C6H12O6
Question:Question:
• Why are plants green?Why are plants green?
Chlorophyll MoleculesChlorophyll Molecules
• Located in the thylakoid membranesthylakoid membranes.
• Chlorophyll pigmentsChlorophyll pigments absorb light (blue blue and red).
• PlantsPlants are greengreen because the green wavelengthwavelength is reflectedreflected, not absorbednot absorbed.
ThylakoidThylakoid
Granum
Has pigment chlorophyllchlorophyll – absorbs light
Wavelength of Light (nm)Wavelength of Light (nm)
400 500 600 700
Short wave Long wave(more energy) (less energy)
Question:Question:
• During the fall, what causes the leaves to During the fall, what causes the leaves to change colors?change colors?
Fall ColorsFall Colors
• During the fall, the green chlorophyllgreen chlorophyll pigments are greatly reducedgreatly reduced revealing the other pigmentsother pigments.
What factors affect What factors affect photosynthesis?photosynthesis?
6CO2 + 6H2O C6H12O6 + 6O2
SUN
•intensity of sunlight
•water
•temperature