BIOLOGY complex plant tissues Tracheids : Cells are dead, long with transverse ends, containing large vacuole. Cell walls are hard, strong. and lignified. Their main functions are to give mechanical strength and to supply water and dissolved minerals from root to the leaves.Complex tissue is composed of more than one kind of cells. They are two types, namely Xylem tissue and Phloem tissue. Tracheid Xylem tissue : Xylem tissue consists of four types of cells, namely: Tracheids, Vessels or Trachaea, Xylem fibre and Xylem Parenchyma. Vessel Vessels or Trachaea: Cells are broad and short, placed end to end to form a continuous hollow tube. Water and waterdissolved minerals are conducted from root to leaf by these cells. �Xylem fibre: These are sclerenchymatous cells. Their main function is to give mechanical strength to the plant. Xylem parenchyma: These are parenchymatous . cells. Functions of these cells are storage and conduction of food materials. Func...
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