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As a plant grows, the stem often becomes thickened and somewhat woody since it is responsible for supporting the upper branches and leaves. Cells in this area of the plant develop

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Cells in this area of the plant develop THICKENED CELL WALLS.
Cell wall is a very important cell organelle in plant, it gives rigidity to the plants' cells thus supporting them, it also perform a host of other activities. Thickened cell wall are usually rich in lignin. Thickened cell wall in plants are also called secondary cell wall.
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thickened cell walls

Cells in the stem, needed for support, develop thickened cell walls. These specialized cells are called collenchyma cells.

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