Transpiration is best defined as the movement of water from soil into the roots and transport via the xylem to leaves where it is lost to the air via the stomata.
In the field of biology, transpiration can be described as a process through which water is lost from the leaves by the process of diffusion.
When there is excess water in the leaves, the guard cells of the stomata open due to which water moves out of the leaves by the diffusion process. The rate of transpiration depends on several factors such as temperature, atmospheric pressure, humidity etc.
The xylem cells bring water from the roots to the leaves where it is utilized and the rest is lost as a result of transpiration.
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