name the components of xylem tissue and also write their functions.
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Xylem (blue) transports water and minerals from the roots upwards.
Xylem is one of the two types of transport tissue in vascular plants, phloem being the other. ...
The most distinctive xylem cells are the long tracheary elements that transport water. ...
Xylem also contains two other cell types: parenchyma and fibers.
Xylem parenchyma is an element of complex tissue called “Xylem”. Parenchyma cells of xylem are mainly involved in the storage of carbohydrate, fats and water conduction.
Classification of plant tissues
Plant tissues can be categorised based on their structure and functions performed. Plant tissues are classified into two types:
Meristematic tissues:
Cells which perform cell division and are responsible for the growth of the plants. There are of 3 types of meristematic tissues based on the regions they are present in plants:
On the basis of origin, there are two types of xylem cells:
Primary xylem: originating from procambium, further divided into protoxylem and metaxylem
Secondary xylem: originating from the vascular cambium
Xylem is composed of four different kinds of elements:
Tracheids: Dead, tube-like cells with a tapering end. They are present mostly in gymnosperm and lower angiosperm. They have a thick lignified wall and lack protoplasm. Their main function is water and mineral transportation.
Vessels: They are present in angiosperms. These are a long cylindrical structure having tube-like appearance. The walls are lignified and have a large central cavity. They are also dead and an annual ring.
What is the main function of xylem?
The main function of the xylem is water transport from roots to the other parts of the plant. Xylem also provides mechanical strength. Tracheids and vessels are the main elements for conducting water. Xylem fibres provide mechanical support and xylem parenchyma stores food materials and tannins and also conducts water radially.