Biology - Regulation of Carbon Dioxide Supply in Plants
Regulation of Carbon Dioxide Supply in Plants
Gas exchange in leaves
Gaseous exchange between the plant's internal and external environments
takes place through the stomata by the process of diffusion. The direction
depends on the slope of the concentration gradient.
Competing demands for reducing water loss (closure of stomata) and entry
of CO2 (open stomata) for photosynthesis  have to be balanced. In some
plants in hot, dry climates, stomata are practically closed during the
hottest part of the day.
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