Timber is

Secondary phloem

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Phellem

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Secondary cortex

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Secondary xylem

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Solution

The correct option is D Secondary xylem
Secondary xylem consists of large-sized vessels and tracheas. Their cell walls are thickened by lignin deposition and it provides excellent mechanical support to the plant. This thicken deposition is the wood of the plant and it is used for making timber.
So the correct option is D.

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