It all begins in the root system with the root hairs that bring in water. It is soaked up through the dermal layer and is pushed through the Casparian Strip. There it gets to the Xylem where it will go up through the plant. There are two ways for it to move, either turgor pressure or cohesion. Turgor pressure is where the pressure from the incoming water by the roots is pushing the water up against gravity. This is usually happening at night when no photosynthesis and evaporation is occurring. The other, cohesion is based on hydrogen/oxygen bonds that bond together to create somewhat of a chain. From there when the stomata is opened and photosynthesis and evaporation happen the chain will be pulled up through the plant and again this is called cohesion.
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