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Secondary Growth of Stems

Secondary Growth of Stems - Secondary Growth of Stems...

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Secondary Growth of Stems An aquatic plant is buoyed by the water in which it grows, and its structural needs are simple. Land  plants, however, require a structural support system. During the course of evolution when plants  developed the ability to synthesize lignin—the polysaccharide that gives rigidity to the cell walls of  wood—large, erect bodies were achievable, and their possessors became highly successful in  colonizing the land. In modern plants, lignified wood cells are the secondary xylem cells. Most of the  primary tissues outside of the vascular cambium are destroyed by the sideways push of the new  cells, and a new group of secondary tissues—the bark—replace them. Formation of the secondary plant body During formation of the primary body, many plants retain meristematic tissues among differentiated  ones. When stimulated to divide, these meristems, called cambia, produce new cells that, together 
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