Chapter 7 Capturing Energy Photosynthesis.

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Presentation transcript:

Chapter 7 Capturing Energy 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

Photosynthesis Photosynthesis

Photosynthesis Light energy Photo- synthesis Carbon dioxide Water Glucose Oxygen gas 8

Photosynthesis 6CO2 + 12 H20 glucose + 6H20 + 6O2 Low energy molecules

Photosynthesis 6CO2 + 12 H20 Light energy glucose + 6H20 + 6O2

Photosynthesis 6CO2 + 12 H20 glucose + 6H20 + 6O2 Light energy caputured glucose + 6H20 + 6O2 Energy stored here

Cell respiration 6CO2 + 12 H20 glucose + 6H20 + 6O2 Energy released and used High energy molecule glucose + 6H20 + 6O2

Electromagnetic radiation

Visible Light

Wavelengths absorbed by plants

Photosynthesis: 2 parts *light reactions *Calvin cycle

Photosynthesis: 2 parts *light reactions Energy collected *Calvin cycle Energy used

Primary photoevent

Energy out Energy in

Photosynthesis: Light Reactions Two photosystems: I and II II. I.

II. Source of electrons Electron excited Photosynthesis: Light Reactions Source of electrons Electron excited

II. Energy harvested from excited electron Photosynthesis: Light Reactions Energy harvested from excited electron

Electron transport system Electrons fall ‘down hill’ giving up energy

II. *ATP *Excited electron Energy at end of photo-system II Photosynthesis: Light Reactions Energy at end of photo-system II *ATP *Excited electron

Photosynthesis: Light Reactions Source of electrons I.

Energy from excited electron stored here 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 Cycle Convert energy from light reaction into sugars

The Calvin Cycle Low energy raw material: CO2

The Calvin Cycle Energy from light reactions

The Calvin Cycle Convert energy from light reaction into sugars glucose

Photosynthesis and cellular respiration

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