The process by which plants become woody is

Impregnation

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Lignification

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Fossilization

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Calcification

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Solution

The correct option is B Lignification
Fibres are long, spindle shaped structures, with tapering or blunt ends. Secondary thickening by lignin deposition accounts for 90% of the area of the cell. The lumen is narrow. Fibres are grouped into xylary fibres and extraxylary fibres. Xylary fibres also called as wood fibres are parts of xylem and are longest among xylem elements.
Thus, the correct answer is option B.

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