Lecture 9 - 1 Fig 10-1 Lecture 10 Photosynthesis Chapter 10...

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Unformatted text preview: 1/27/2012 1 Fig. 10-1 Lecture 10 Photosynthesis Chapter 10 Goals of This Lecture 1. Learn the stages of photosynthesis and where they are located in the plant. 2. Learn the spectrum of light and how it affects photosynthesis; the pigments and how they absorb certain wavelengths of light 3. Learn how plants make sugars (Calvin Cycle) and what it costs in terms of ATP and NADPH 1/27/2012 2 3 2 stages of photosynthesis • Light reactions – Take place in thylakoid membranes – Produce ATP, NADPH and O 2 • Calvin cycle – Occurs in stroma of chloroplasts – Uses ATP and NADPH to incorporate CO 2 into organic molecules Fig. 10-3 Leaf cross section Vein Mesophyll Stomata CO 2 O 2 Chloroplast Mesophyll cell Outer membrane Intermembrane space 5 μm Inner membrane Thylakoid space Thylakoid Granum Stroma 1 μm 1/27/2012 3 Light Fig. 10-5-4 H 2 O Chloroplast Light Reactions NADP + P ADP i + ATP NADPH O 2 Calvin Cycle CO 2 [CH 2 O] (sugar) 6 Light energy • Type of electromagnetic radiation • Travels as waves – Short to long wavelengths • Also behaves as particles- photons – Shorter wavelengths have more energy 1/27/2012 4 7 8 • Chlorophyll a • Chlorophyll b • Carotenoids 1/27/2012 5 Fig. 10-9 Wavelength of light (nm) (b) Action spectrum (a) Absorption spectra (c) Engelmann’s experiment Aerobic bacteria RESULTS Filament of alga Chloro- phyll a Chlorophyll b Carotenoids 500 400 600 700 700 600 500 400 10 • Photosynthetic pigments absorb some light energy and reflect others – Leaves are green because they reflect green wavelengths • Absorption boosts electrons to higher energy levels • Wavelength of light that a pigment absorbs depends on the amount of energy needed to boost an electron to a higher orbital 1/27/2012 6 Fig. 10-7 Reflected light Absorbed light Light Chloroplast Transmitted light Granum Pigment molecules...
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Lecture 9 - 1 Fig 10-1 Lecture 10 Photosynthesis Chapter 10...

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