Xylem tissue is composed of

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(C) Xylem is a complex permanent tissue composed of four different kinds of elements:$(i)$ Tracheids: Elongated or tube-like cells with thick,lignifie

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Four different kinds of elements

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(C) Xylem is a complex permanent tissue composed of four different kinds of elements:$(i)$ Tracheids: Elongated or tube-like cells with thick,lignified walls and tapering ends. These are the main water-transporting elements.$(ii)$ Vessels: Long cylindrical tubes with lignified walls and a large central cavity. These are a characteristic feature of angiosperms.$(iii)$ Xylem fibres: Cells with highly thickened walls and obliterated central lumens,which may be septate or aseptate.$(iv)$ Xylem parenchyma: Living cells with thin cellulose walls,used to store food in the form of starch or fat.

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