Xylem is the specialized tissue of the plants that transports water and nutrients from the soil to the upper parts like stems and leaves of plant and provides mechanical support to them. It is composed of four different types of the cells. Which of the following is not one a type of cell found in xylem tissues?
Answers
What is Xylem made of?
Xylem is a complex tissue. Xylem is composed of 4 elements: tracheids, vessels, xylem parenchyma and xylem fibres. Vessels are not present in gymnosperms.
What are the types of xylem?
The xylem is of two types, primary xylem and secondary xylem.
1. Primary xylem: the first formed primary xylem is called protoxylem and later formed primary xylem is metaxylem. There are two types of organisation of primary xylem:
Endarch- present in the stem, protoxylem is towards pith and metaxylem is towards the periphery
Exarch- present in the roots, metaxylem in the centre and protoxylem towards the periphery
2. Secondary xylem: these are formed due to the action of the vascular cambium and responsible for an increase in the girth of the plant. The cells that cut off towards pith mature into secondary xylem. The two types of secondary xylem formed during spring and autumn constitute 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.
Answer:
Xylem parenchyma
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