The widening of a tree trunk is mostly due to the activity of its

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The widening of a tree trunk is mainly due to the activity of its vascular cambium, which is a lateral meristem responsible for the production of secondary xylem and secondary phloem. The secondary xylem accumulates year after year, contributing to the increase in diameter of the trunk. The apical meristem is responsible for the elongation of the stem, while phelloderm is a thin layer of parenchyma cells found in some plants, and primary xylem is formed during primary growth and does not contribute significantly to the growth in diameter of the trunk.

The Widening of a Tree Trunk Is Mostly Due to the Activity