Final answer:
The region of maturation in plant roots is where cells differentiate into specialized cell types, such as root hairs for nutrient absorption.
Step-by-step explanation:
In plant roots, the region of maturation refers to the area where root cells begin to differentiate into specialized cell types. This zone is located just behind the zone of elongation and is characterized by the presence of root hairs. The cells in this region become specialized to perform specific functions, such as nutrient absorption in the case of root hairs.