Stomata are pores formed by a pair of cells, the guard cells which can open and close to control the exchange between a plant and the environment.
They have a crucial role for photosynthesis and transpiration of plants.These pores are the entry points for CO2, for photosynthesis and an exit for water vapor from the transpiration stream.
Stomata’s major function is to allow sufficient CO2 to enter the leaf thus optimizing photosynthesis, while conserving as much water as possible. Under some environmental conditions, evaporative cooling of the leaf by water loss via transpiration may be a factor in lowering leaf temperature.
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