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Roots grow longer because of cell division in the:

AApical meristem (at the root tip)
BLateral meristem
CIntercalary meristem
DPhloem
Answer & Solution
Correct answer: A. Apical meristem (at the root tip)
Apical meristems sit at the tips of roots and shoots. Their division pushes the tip forward (in roots: downward into the soil), increasing length. If you cut off the root tip, longitudinal growth stops — which is why pruning a plant tip stunts vertical growth.
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