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Vibha's statement is incorrect. Apical meristems are at the root and shoot tips, but there are also lateral meristems (which thicken the stem) and intercalary meristems (at the nodes of grasses).
Neha could ask: "If meristems are only at the tips, then how does a tree trunk grow thicker, and how does grass grow back after it is cut?" This points to the lateral and intercalary meristems.
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