Xylem


 
 
Concept Explanation
 

Xylem

Xylem: Xylem, or wood, as it is often called, is a complex tissue. The cells are thick-walled, tubular and often dead. This tissue has four types of cells : tracheids, vessels, xylem parenchyma and xylem fibres. Of these only tracheids and vessels transport sap.

  • Tracheids are elongated, tube-like cells with sloping walls, enclosing a large, empty cavity. The cavities are empty because the cells are dead. The walls are heavily thickened with lignin.
  •  Vessels  are fiitting together end to end, vessels form long tubes or pipes for the conduction of water and minerals from the root to the leaf. The partitions between the cells dissolve to form long pipelines. Vessels too are dead cells with lignified walls. All vascular plants do not have vessels. Ferns, for example, have only tracheids.
  • Wood parenchyma is made of parenchymatous cells which store food and help in the lateral conduction of water or sap.
  • Wood fibres are long clerenchymatous cells associated with xylem. They are mainly mechanical or supportive in function. In fact, other than wood parenchyma all xylem cells are dead and lignified, and hence, they provide mechanical strength.
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    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Which of the following is responsible for conduction of water in the branches of a large tree?

    Right Option : C
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    Question : 2

    Plants cells are constructed into three tissue types. Which tissue has the function of transport within the plant ?

                                         

     

    Right Option : C
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    Explanation
    Question : 3

    Which of the following components is not found in xylem?

    Right Option : D
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    Explanation
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