What is primary tissue and secondary tissue?
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Plant primary tissue includes: epidermal tissue (like skin, the outer covering of a plant), vascular tissue (xylem and phloem, which conduct water and sap respectively), and ground tissue (all other tissue that makes up a plant). All plants have primary tissue (although bryophytes lack vascular tissue).
Secondary tissue results from lateral (sideways) growth, and some herbaceous plants have hardly any secondary growth. Dicots (woody plants) have secondary growth which makes them increase in girth. Such growth results from a thickening of secondary xylem (which is one of the components of wood), and from an outgrowth of the cork cambium which produces, in part, what we call bark.
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