The growth zone that gives rise to thick accumulations of secondary xylem and phloem is the

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The vascular cambium is a lateral meristem responsible for producing secondary growth in stems and roots. It produces secondary xylem (wood) and phloem, which accumulate to form thick layers over time. The cork cambium is responsible for producing outer bark and does not produce secondary xylem or phloem. The apical meristem is responsible for primary growth in plant tissues.

The Growth Zone That Gives Rise to Thick Accumulations of Secondary