what is xylem and explain.
Answers
Xylem is a vascular tissue in plants which conducts water and dissolved nutrients upwards from the root and also helps to form the woody element in the stem.
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Answer:
Xylem is a complex permanent tissue which conducts water and mineral salts upward from roots to leaves.
Structural elements of xylem:
Tracheids are elongated, dead cells with large cavities and possess highly lignied, thick walls.
Depending upon the kind of thickening, tracheids may be annular, spiral, reticulate, scalariform and pitted.
Vessels are broader as compared to the tracheids. These are composed of many cells, joined end to end with their walls perforated to give it a tube-like appearance. They also show thickening like the tracheids.
Xylem Parenchyma : It is parenchyma present in xylem. The cells are, however smaller and thick walled. Xylem parenchyma stores food and helps in lateral conduction of sap or water
Functions of each of the elements are:
Tracheids: They transport water and minerals vertically.
Vessels: They also transport water and minerals vertically.
Xylem parenchyma: It stores food and helps in sideways conduction of water.