Phloem is a structure in vascular plants that transports sugars from the leaves, called "sources", to nonphotosynthetic parts of the plant, called "sinks". Sinks can be either roots, new shoots or developing seeds. The sugars are transported as a water-based sap and can move either up or down the channel to the nearest sink in a process called translocation. In the trunk of the oak tree seen above, a layer of living phloa is located in a ring just within the cork layer.
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