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Question

Lignin is the important constituent in the cell wall of

A
phloem
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B
parenchyma
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C
xylem
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D
cambium
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Solution

The correct option is C xylem
Lignin is the important constituent in the cell wall of xylem. Xylem consists of four different types of elements- tracheids, vessels, and xylem parenchyma and xylem fibres. Wall of tracheids are highly thickened by the deposition of lignin, except at certain points called as pits.

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