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Again, you may wonder, How do plants defy gravity? Do they have a pump like us humans do, or is it something else? The answer to this question is evaporation. In a plant, water is constantly being evaporated. The tiny pores of leaves, called stomata, open up for gas exchange, and while they have opened up, evaporation occurs. This process is called transpiration.

The evaporation of the water causes a suction-like force, also known as transpiration pull. This, in turn, helps the xylem pull water in an upward direction and transport it to the other parts of the plant. Transpiration is similar to when you drink something with a straw—there is a suction force that helps you drink it.

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