Question

how does a tree develop its trunk​

Answer 1

Explanation:

The tree trunk has to lengthen and expand as the tree grows in its search for moisture and sunlight. A tree's diameter growth is done via cell divisions in the cambium layer of the bark. The cambium is comprised of growth tissue cells and found just under the bark.

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Answer 2

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The growth rings are concentric rings, also known as annual rings. Secondary growth gives rise to these rings. Secondary growth occurs due to the activity of meristematic tissue, cambium. By counting these rings, one can determine the age of the tree.