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A waxy barrier in the plant root.

The waxy barrier in the plant root prevents molecules that are in the cell walls from entering the xylem directly. To move into the xylem, molecules must first cross a plasma membrane and enter the cytoplasm of a root cell. This allows a plant to be selective about what enters the xylem.

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Q: Which of the following allows plants to be selective about the molecules that enter the xylem?
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