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Alternative Pathways in Photosynthesis. Figure 10.20 A review of photosynthesis.

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Presentation on theme: "Alternative Pathways in Photosynthesis. Figure 10.20 A review of photosynthesis."— Presentation transcript:

1 Alternative Pathways in Photosynthesis

2 Figure 10.20 A review of photosynthesis

3 “C 3 ” Plants

4 Guard cells Pore Stoma 18 µm Leaf surfaces contain stomata Photosynthesis relies on CO 2 entering the leaf and O 2 leaving the leaf

5 Leaf cross-section CO 2 Carbon dioxide diffuses into leaves through stomata H2OH2O BUT: water also escapes through the stomata

6 CO 2 stored in mesophyll cell CO 2 used in adjacent bundle sheath cell Organic acid Calvin cycle CO 2 G3P CO 2 C 4 plants sequester CO 2 in certain cells C 4 pathway Examples of C 4 plants: corn, sugarcane, many grasses

7 Figure 10.18 C 4 leaf anatomy and the C 4 pathway

8 C 4 Plants

9 CO 2 used during the day CO 2 stored at night CO 2 G3P Calvin cycle Organic acid CAM plants sequester CO 2 at night C 4 pathway Examples of CAM plants: pineapples, cacti, and most succulents.

10 CAM Plants Welwitschia

11 Figure 10.19 C 4 and CAM photosynthesis compared

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