What is xylem? Name the four elements of xylem and write one function of each.
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The tissues of xylem are derived from primary meristem. The xylem is usually made up of four types of cells: tracheids, vessels, fibers and parenchyma. Tracheid: They are elongated dead cells with both ends tapering. They are found in xylem of gymnosperms, pteridophytes and angiosperms.
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Vascular tiisue system of the plant helps in the transportation of water and food in the plant.
Xylem – This tissue helps in the transport of water and dissolved substances throughout the plant. The different components of the xylem include tracheids, vessels, xylem parenchyma and xylem fibres.
*Tracheids form the main conductive cells of some non-flowering plants. Water moves from the cell to cell through side walls. These cells are elongated cells with tapering ends. These cells with cell walls bear spiral, pitted or bordered-pitted thickenings.
*Vessels are advanced water conductive elements mostly seen in flowering plants. The cell walls are thickened with lignin. These provide rigidity and resistance to the cell wall and prevents it from collapsing during excess transpiration.
*Xylem parenchyma are the living cells of the xylem. They perform functions like secretion and storage.
*Xylem fibres are midway between tracheids and xylem parenchyma (libriform fibres). They provide lot of support to the plants.
Vascular tiisue system of the plant helps in the transportation of water and food in the plant.
Xylem – This tissue helps in the transport of water and dissolved substances throughout the plant. The different components of the xylem include tracheids, vessels, xylem parenchyma and xylem fibres.
*Tracheids form the main conductive cells of some non-flowering plants. Water moves from the cell to cell through side walls. These cells are elongated cells with tapering ends. These cells with cell walls bear spiral, pitted or bordered-pitted thickenings.
*Vessels are advanced water conductive elements mostly seen in flowering plants. The cell walls are thickened with lignin. These provide rigidity and resistance to the cell wall and prevents it from collapsing during excess transpiration.
*Xylem parenchyma are the living cells of the xylem. They perform functions like secretion and storage.
*Xylem fibres are midway between tracheids and xylem parenchyma (libriform fibres). They provide lot of support to the plants.
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