LS_2_Lec_6_Photosyn

LS_2_Lec_6_Photosyn - Life Sciences 2 Photosynthesis Chapter 10 Dr Joseph Esdin Photosynthesis The biochemical process by which plants convert

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1/5/12 1 Life Sciences 2 Photosynthesis Chapter 10 Dr. Joseph Esdin Photosynthesis • The biochemical process by which plants convert light energy into chemical energy • It is the very basis of life on Earth • Its chemical reaction is: 6 CO 2 + 12 H 2 O + light energy C 6 H 12 O 6 + 6 O 2 + 6 H 2 O
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1/5/12 2 Photosynthetic Organisms Plants Purple sulfur bacteria Alga Protist Cyanobacteria What is Light? • Light is a form of energy known as electromagnetic radiation • Travels in rhythmic waves • The distance between waves is called a wavelength ( λ ) • Wave length range from short to long • The entire range is called electromagnetic spectrum • Electromagentic waves are disturbances of electric and magnetic fields
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1/5/12 3 What is the Visible Light? • The waves that can be detected by the human eye in various colors is called visible light • When light meets matter it may be – Reflected – Transmitted – Absorbed Visible Light Violet 400 nm Red 700 nm
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1/5/12 4 Reflected light Absorbed light Light Chloroplast Transmitted light How We See Green in Leaves? Photons • Light consists of discrete particles called photons • Each photon has a fixed amount of energy
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1/5/12 5 Photons • When a photon reaches a molecule – Photon may be reflected – Photon may pass through – Photon my be absorbed • If absorbed, the pigment will acquire the energy of the photon – Molecule moves from the ground state to the excited state Photons • Acquiring the energy bumps an electron to a higher shell • This makes the electron less attracted to the nucleus and therefore the molecule becomes more reactive
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This note was uploaded on 02/01/2012 for the course LS 2 taught by Professor Pires during the Spring '08 term at UCLA.

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LS_2_Lec_6_Photosyn - Life Sciences 2 Photosynthesis Chapter 10 Dr Joseph Esdin Photosynthesis The biochemical process by which plants convert

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