The layers of xylem in a stem.
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(4) Layers of Xylem in a stem
The tree forms new cells annually, organized in concentric circles termed as annual rings or rings of annual growth. The quantity of wood generated during one growing season is shown by these annual rings. The complete ring, labelled as cambial ring, is built as the stem grows. The Cambial Ring contributes to secondary xylem and secondary phloem development.
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Just inside the cambium is a layer of active xylem that transports water and nutrients. Inside that layer is a layer of xylem cells that no longer carries water and nutrients. This layer, which is called heartwood, strengthens the stem, providing the tree with additional support.
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