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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Leaf surfaces contain stomata
BUT: water also escapes through the stomata
C4 plants sequester CO2 in certain cells
CO2 stored in mesophyll cell
CO2 used inadjacent bundle sheath cell
Examples of C4 plants: corn, sugarcane, many grasses
CAM plants sequester CO2 at night
CO2 storedat night
CO2 usedduring the day
Examples of CAM plants: pineapples, cacti, and most succulents.