Lesson 1, Topic 5
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Structure of plant stem: Xylem, Pith & medullary rays

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Lignin: a complex organic polymer deposited in the cell walls of many plants, making them rigid and woody.from ligni- ‘of wood’ + -in

Medulla: the inner region of an organ or tissue, especially when it is distinct from the outer region (cortex)

Cortex: an outer layer of tissue immediately below the epidermis of a stem or root.