Cell wall of xylem is rich in

Starch

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Lignin

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Lipid

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Protein

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Solution

The correct option is D Lignin
Lignin which is present in cell wall of Xylem is a class of complex organic polymers that form important structural materials in the support tissues of vascular plants. Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily.
So, the correct answer is 'Lignin.'

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Q. Match the column:

List I	List II
A) Tracheids	I) Cells possess highly thickened walls with oblilateral central human
B) Vessels	II) Elongated tube like cells with thick lignified walls and tapering ends
C) Xylem parenchyma	III) Individual members are interconnected through perorations in their common walls
D) Xylem fibers	IV) Cells are living with thin cellulosic cell walls

Assertion (A): Xylem is composed of different kinds of elements.
Reason (R): Xylem parenchyma cells are living and thin walled. The main function of xylem parenchyma is to store starch and fatty substances.

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