BIO 311c Ch 9. Photosynthesis - Handout

BIO 311c Ch 9. Photosynthesis - Handout - Energy Flow...

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1 PHOTOSYNTHESIS K. Sathasivan Leaf Anatomy Basic Concepts Light Reactions Cyclic Electron Transfer Non Cyclic Electron Transfer Calvin Cycle C3 C4 CAM Energy Flow PHOTOAUTOTROPHS (a) Plants (c) Unicel ular protist 10 μm 1.5 μm 40 μm (d) Cyanobacteria (e) Purple sulfur bacteria (b) Multicel ular alga Figure 8.20 Energy Losses During Photosynthesis Leaf Anatomy (Xylem and Phloem) Basic Concepts Overall Reaction 6 CO 2 + 12 H 2 O C 6 H 12 O 6 + 6H 2 O + 6O 2
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2 Photosynthesis The two stages of photosynthesis are linked together and occur at the same time Fig. 9-2, p. 179 Electromagnetic Spectrum Chlorophyll Chlorophylls are the major photosynthetic pigments in plants, green algae, and cyanobacteria Fig. 9-6a, p. 183 Carotenoids Carotenoids expand the range of wavelengths absorbed Fig. 9-6b, p. 183 a. The absorption spectra of chlorophylls a and b and carotenoids n of light (%) Chlorophyll a Carotenoids Chlorophyll b Fig. 9-7a, p. 184 Absorptio Wavelength (nm) b. The action spectrum in higher plants, representing the combined effects of chlorophylls and carotenoids te of O 2 release photosynthesis Fig. 9-7b, p. 184 Wavelength (nm) The peaks in the action spectrum are typically broader than those for the individual pigments, reflecting both their combined effects and changes in the absorption spectra of individual pigments by their combination with proteins in chloroplasts. Ra in
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3 Strand of Light A glass prism breaks up a beam of light into a spectrum of colors, which are cast across a microscope slide.
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BIO 311c Ch 9. Photosynthesis - Handout - Energy Flow...

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