Tracheids

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(C) Tracheids are elongated cells with tapered ends. Their cell walls are usually extensively thickened by the deposition of lignin,which provides str

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Are responsible for water conduction and support in many land plants

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(C) Tracheids are elongated cells with tapered ends. Their cell walls are usually extensively thickened by the deposition of lignin,which provides structural support. Water flows from one tracheid to another through unthickened regions known as pits in the cell walls. They are the primary water-conducting elements in gymnosperms and pteridophytes,and are also present in angiosperms.

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