The increase in girth is caused by continuous division of cells in the lateral meristem. These cells form new tissues concentrically inside and outside the stem, increasing diameter, producing annual rings and strengthening the plant body over time.
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The increase in plant girth occurs because lateral meristematic cells divide repeatedly. These actively dividing cells produce new cells towards the inner and outer sides of the stem in concentric layers. As more cells are added, the stem becomes thicker. This process also forms annual growth rings and provides strength and support to older plants and trees.
For more NCERT Solutions of Class 9 Science Exploration Chapter 3 Tissues in Action Question Answer (2026-27)
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