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The plants have internal tubes called xylem that facilitate this process. Inside the xylem, there is water. This water stretches directly from the roots to the leaves. When the water molecules are at the leaves, they evaporate, leaving the plant. Since these evaporated molecules of water were previously in the chain of water molecules, they pull the whole chain of water molecules up the xylem, from the roots to the leaves. This chain continually pulls water through the plant, as when a molecule is evaporated, the whole chain moves up a molecule, pulling each consecutive molecule up a space.

This chain is possible, because water is polar. The electronegative force of the oxygen is much greater than that of the two hydrogen atoms, thus hydrogen atoms bond with other oxygen atoms in an attempt to fulfill the oxygens force.

This is called cohesion - the ability of a substance to bond to itself. This allows each water molecule in the plant's xylem to bond to other molecules, pulling the chain up and up as water evaporates from the top of the plant, in its leaves.

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What are carry fluids from the roots to the leaves of vascular plants?

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What explains the process by which water moves from the roots to the leaves of plants?

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Assuming you mean vascular plants the transportation system here are the vascular tissues. The xylem moves water from the roots to the leaves. The phloem moves sugars, carbohydrates, from the leaves to everywhere in the plant needing these sugars.


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