Annual rings are the number of (1) Internodes in a stem (2) Rings of vascular bundles in a monocot stem. (3) Barks layers in a woody stem. (4) Layers of Xylem in a stem.

Answer: (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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