Transcript Photosynthesis - Siegel High School

Photosynthesis
SPI.3.3 Compare and contrast
photosynthesis and cellular
respiration in terms of energy
transformation.
Energy
• Ability to do work
• Autotroph = creates own
• Heterotroph = obtains from food
ATP
• Adenosine TriPhosphate
• Used by all cells for energy
How Does ATP release energy?
• ATP breaks off a phosphate
which releases energy
adenosine
P
P SNAP P
Here is ATP
(Adenosine Triphosphate)
I’m
free!!!
!
adenosine
P
P
We get ADP
(Adenosine Diphosphate)
P
ADP
•Will be recharged by adding a phosphate
What does a plant use to obtain
its mass?
Photosynthesis
• Capturing light energy
from the sun and changing
it into food
• Performed by plants,
algae, & some bacteria
• Supplies food for other
organisms
Chloroplast
• Chloroplast is the organelle where
chlorophyll is housed
Pigments
• Absorb light
• Two main pigments = Chlorophyll a &
Chlorophyll b
• Chlorophyll = Green color
Why is Chlorophyll Green?
• Absorbs violet & red λs
λ = wavelength
• Reflects green λs
Photosynthesis Formula
6CO2 + 6H2O
Carbon
Dioxide
Water
Sunlight
Chlorophyll
C6H12O6 + 602
Glucose
Oxygen
Two Types of Reactions
• Light Dependent Reactions
• Light Independent Reactions
–Calvin Cycle
Light Dependent Rxn
• Thylakoid – contains chlorophyll
• Uses light energy to break down water to produce
energy & oxygen
Calvin
Cycle
Released to
atmosphere
Light Independent Rxn
• AKA Calvin Cycle
• Stroma
• Uses energy from
light dependent rxns
& CO2 to make sugar
Enters through stomata
Calvin Cycle is Dependent on
Light Rxn
• Why?
• Needs the
energy from
thylakoids rxn to
supply energy to
make the sugar
Affects on the Rate of
Photosynthesis
• Water
• Temperature
–0 – 35 ºC = best enzyme function
• Intensity of light