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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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photosynthesis relies on co 2 entering the leaf and o 2 leaving the leaf
Photosynthesis relies on CO2 entering the leaf and O2 leaving the leaf

Leaf surfaces contain stomata

18 µm

Pore

Stoma

Guard cells

slide5

Carbon dioxide diffuses into leaves through stomata

H2O

Leaf cross-section

BUT: water also escapes through the stomata

CO2

slide6

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

slide9

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.

cam plants
CAM Plants

Welwitschia

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