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Alternative Pathways in Photosynthesis

Alternative Pathways in Photosynthesis. Figure 10.20 A review of photosynthesis. “C 3 ” Plants. Photosynthesis relies on CO 2 entering the leaf and O 2 leaving the leaf. Leaf surfaces contain stomata. 18 µm. Pore. Stoma. Guard cells. Carbon dioxide diffuses into leaves through stomata.

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Alternative Pathways in Photosynthesis

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  1. Alternative Pathways in Photosynthesis

  2. Figure 10.20 A review of photosynthesis

  3. “C3” Plants

  4. Photosynthesis relies on CO2 entering the leaf and O2 leaving the leaf Leaf surfaces contain stomata 18 µm Pore Stoma Guard cells

  5. Carbon dioxide diffuses into leaves through stomata H2O Leaf cross-section BUT: water also escapes through the stomata CO2

  6. C4 plants sequester CO2 in certain cells CO2 CO2 stored in mesophyll cell Organicacid C4 pathway CO2 CO2 used inadjacent bundle sheath cell Calvin cycle G3P Examples of C4 plants: corn, sugarcane, many grasses

  7. Figure 10.18 C4 leaf anatomy and the C4 pathway

  8. C4 Plants

  9. CAM plants sequester CO2 at night CO2 CO2 storedat night Organicacid C4 pathway CO2 Calvincycle CO2 usedduring the day G3P Examples of CAM plants: pineapples, cacti, and most succulents.

  10. CAM Plants Welwitschia

  11. Figure 10.19 C4 and CAM photosynthesis compared

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