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Capturing EnergyChapter 7
Photosynthesis
Photosynthesis
Solar energy is stored in chemical bonds
Cellular Respiration
Energy from chemical bonds extracted and used
Energy stored
Photosynthesis
Energy extracted
Cellular respiration
Photosynthesis
Photosynthesis
PhotosynthesisPhotosynthesis
Lightenergy
Carbondioxide
Water
Photo-synthesis Glucose Oxygen
gas
Photosynthesis
glucose + 6H20 + 6O2
6CO2 + 12 H20
Low energy molecules Low energy molecules
Photosynthesis
glucose + 6H20 + 6O2
6CO2 + 12 H20
Light energy
Photosynthesis
glucose + 6H20 + 6O2
6CO2 + 12 H20
Light energy caputured
Energy stored here
Photosynthesis
glucose + 6H20 + 6O2
6CO2 + 12 H20
Energy released and used
Cell respiration
High energy molecule
Electromagnetic radiation
Visible Light
Wavelengths absorbed by plants
Photosynthesis: 2 parts
*light reactions
*Calvin cycle
Photosynthesis: 2 parts
*light reactions
*Calvin cycle
Energy collected
Energy used
Primary photoevent
Energy outEnergy in
Photosynthesis: Light ReactionsTwo photosystems: I and II
II.
I.
Photosynthesis: Light Reactions
Source of electrons
II.
Electron excited
Energy harvested from excited electron
Photosynthesis: Light Reactions II.
Electron transport system
Electrons fall ‘down hill’ giving up energy
Energy at end of photo-system II
Photosynthesis: Light Reactions
*ATP
*Excited electron
II.
Source of electrons
I.
Photosynthesis: Light Reactions
Photosynthesis: Light Reactions
Energy from excited electron stored here
Photosynthesis: Light Reactions
Energy in
Photosynthesis: Light Reactions
Energy stored
Calvin Cycle*Energy from collected in
Photosystems is tied up in glucose
The Calvin CycleConvert energy from light reaction into sugars
The Calvin CycleLow energy raw material: CO2
The Calvin CycleEnergy from light reactions
The Calvin CycleConvert energy from light reaction into sugars
glucose
Photosynthesis and cellular respiration
