CAM: A Water-Conserving Adaptation
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State
Crassulacean acid metabolism opens stomata and stores carbon dioxide overnight, then closes them by day and runs the Calvin cycle on that stored carbon.
Show
A cactus opens its stomata at night, when cooler air cuts water loss, then keeps them shut through the day's heat.
Watch for
This adaptation shifts when carbon dioxide is captured, not how the Calvin cycle itself runs.