Transpiration is the process whereby plants expel water.
Water is absorbed by the roots and travels in vessels up the stem called xylem tubes to the leaves.
There are pores on the leaves called stomata, surrounded by guard cells.
When the plant has lots of water, the pressure of the turgidity forces the guard cells open, and water is lost through the stomata.
When the plant has little water and is flaccid, the guard cells stay closed, and transpiration comes to a stop.
Factors affecting transpiration are the light level, wind, humidity, and temperature.
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