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LS2 Lec 6 Photosyn (4 Slides)

LS2 Lec 6 Photosyn (4 Slides) - Photosynthesis Life...

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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 -> C 6 H 12 O 6 + 6 O 2 + 6 H 2 O 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 ( ! ) Wave length range from short to long The entire range is called electromagnetic spectrum
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2 What is 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 High Energy Low Energy Low Wavelength High Wavelength Reflected light Absorbed light Light Chloroplast Transmitted light How We See Colors? Photons Light consists of discrete particles called photons Each photon has a fixed amount of energy
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3 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
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