Photosynthesis: Physiological and Ecological Considerations

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9.5 Photosynthetic Responses to Caron Dioxide 359.5.1 Atmospheric CO 2 concentration keeps risingFIGURE 9.19 Concentration of atmospheric CO 2 from 420,000 years ago to the present.Web Topic 9.5Prehistoric Changes in Atmospheric CO 2The history of atmospheric CO 2on Earth has been one of slow but constant changes,far slower than the rate of today’s atmospheric CO 2changes. The last million year’sworth of history of atmospheric carbon dioxide is trapped in the ice core bubbles.36•These ice core data show thatatmospheric CO 2levels changedbetween 180 ppm (glacial periods)<strong>and</strong> 280 ppm (interglacial periods)as Earth moved in <strong>and</strong> out of iceages.•As of January 2007, the CO 2concentration in Earth’s atmospherewas about 0.0383% by volume, or383 ppmv.Web Figure 9.5.A Air bubbles trappedinside frozen ice. Courtesy ofNewScientist.com:http://www.newscientist.com/data/images/ns/cms/dn8369/dn8369-1_500.jpg•ppm, part per million(a) by mass: 1 mg/kg(b) by volume: 1 mL/10 3 L (cm 3 /m 3 )18
THE GREENHOUSE EFFECT37FIGURE 9.19 Concentration of atmospheric CO 2 from 420,000 years ago to the present.9.5.2 CO 2 diffusion to the chloroplast is essential tophotosynthesis38FIGURE 9.20 Points of resistance tothe diffusion of CO 2 from outside theleaf to the chloroplasts.19
Page 1 and 2: 1Lincoln Taiz and Eduardo ZeigerPla
Page 3 and 4: 56•Light can be measured as energ
Page 5 and 6: 9.2.1 Light anatomy maximizes light
Page 7 and 8: 9.2.3 Leaf angle and leaf movement
Page 9 and 10: 17(triangle orache)(wild ginger)Das
Page 11 and 12: 21(triangle orache)FIGURE 9.10 Ligh
Page 13 and 14: THE XANTHOPHYLL CYCLE25An epoxide i
Page 15 and 16: •Two types of photoinhibition29FI
Page 17: 33Scientific Name: Tidestromia oblo
Page 21 and 22: 411 Pa = 1 Newton per meter 2 (N m
Page 23 and 24: 45CO 2 assimilationH 2 O evaporatio

Photosynthesis: Physiological and Ecological Considerations

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