Dermal, Vascular, and Ground Tissue
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Meristematic cells differentiate into three permanent tissue types: dermal tissue for covering, vascular tissue for transport, and ground tissue for photosynthesis and support.
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A stem's outer epidermis is dermal tissue; its xylem and phloem are vascular tissue; its pith and cortex are ground tissue.
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All three types trace to one meristematic origin — the distinction lies in function, not lineage.