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Structure of Woody Plant (Secondary Xylem secn (heartwood …
Structure of Woody Plant
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Secondary Xylem 
growth ring
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reaction wood
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wood formed due to the response of gravity so, the cambium cells are oriented vertical
heartwood
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it is a dead, inner wood, which often comprises the majority of a stem's cross-section.
sapwood
it is the living, outermost portion of a woody stem or branch
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brings water and nutrients up from the roots through tubes inside of the trunk to the leaves and other parts of the tree
outer bark
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cork and cambium
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pith- soft & spongy tissue
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