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20 Cards in this Set
- Front
- Back
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In the oxygenase pathway for rubisco |
O2 is consumed and co2 is produced |
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What causes co2 in the leaf to incline? |
When stomata are closed When temp increases, less co2 is dissolved in water compared to o2 |
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Under ___ and ___ conditions, c3 plants can lose as much as __% of fixed carbon |
Hot and dry, 50 % |
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C4 photosynthesis steps |
- co2 incorporated into a 4 carbon compound in mesophyll cells -transported to specialized bundle sheath cells at higher concentration for Calvin cycle |
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CAM photosynthesis steps |
-co2 is fixed at night -delivered to chloroplasts during day |
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C4 has __ carbon pathways that operate in different cells |
2 |
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C3 pathway (c4) happens in |
Bundle sheath cells |
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C4 pathway happens in |
Mesophyll cells |
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In c4, co2 from atmosphere is fixed into ____ by ____ |
Oxaloacetate, pep carboxylase |
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Oxaloacetate is converted into ___ |
Malate (malic acid) |
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Co2 from ____ is released into bundle sheath cells |
Malate |
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Co2 is fixed again by ____ in bundle sheath cells |
Rubisco |
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How does the c4 pathway stop photorespiration? |
Pep carboxylase does not have a competing oxygenase activity No Rubisco in mesophyll cells -> no photorespiration! Co2 concentration is higher from malate and thick walled bundle sheath exclude o2 |
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Challenges desert plants face |
Frequent high temps, limited water, low humidity |
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Desert plants have evolved to fix co2 at |
Night |
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Cam stands for |
Crassulacean acid metabolism |
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The Malate produced at night is stored in the |
Vacuole |
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Cam plants do c3 photosynthesis during the |
Day |
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In CAM, stigmata close duirng the ___ and open during the ____ |
Day, night |
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Cam plants do c4 photosybthesis during the |
Night |
