Question

give the name of different cells which involve in the formation of xylem.

Answer 1

Explanation:

Differentiation of vascular tissues from the procambium/vascular cambium follows two different developmental pathways to produce xylem and phloem elements, xylary fibres, and xylem parenchyma cells

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Answer 2

Xylem originates from the Greek word “xylon” that means wood. Carl Nägeli coined the word xylem. Xylem is a type of vascular tissue present in plants, which primarily transports water and nutrients from roots to stem and leaves. They also provide mechanical strength to the 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 lack protoplasm. They have many cells called vessel members which are interconnected through a perforation in common walls. Mostly involved in the conduction of water, minerals and give mechanical strength to the plant

Xylem Fibre: Dead cell with lignified walls and a central lumen. Involved in water transportation and providing mechanical support

Xylem Parenchyma: Only living cells of xylem and store starch and fat. They assist in the short distance transportation of water

Structure of Xylem Parenchyma

Parenchyma cells associated with xylem are called “xylem parenchyma”.

There are two major types of parenchyma cells in secondary xylem

Axial parenchyma cells arranged around the axis

Radial parenchyma cells arranged like a ray, radiating out of the common centre