Increases in plant length (such as overall height or branch and root length)result from cell division that occurs:

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Quizplus · Accepted Answer

Plant length increases primarily from the activity of apical meristems located at the tips of shoots and roots. These meristems contain undifferentiated cells that divide and differentiate into the various types of cells found in the plant body. While lateral meristems do contribute to plant growth, they primarily increase plant girth rather than length. Cell division in differentiated cells is very limited in plants, and their growth largely results from stretching and expansion of existing cells.

Increases in Plant Length (Such as Overall Height or Branch