AIIMS 2019 Biology Root Structure MCQ Question

The quiescent center, as identified by Clowes, refers to a region in the root tip where cells exhibit low levels of DNA, RNA, and protein synthesis, indicating a state of dormancy and resistance to damage, which aligns with the characteristics of the zone of maturation (D). In contrast, the root cap (A) is primarily involved in protecting the root tip and facilitating its movement through the soil, while the meristematic zone (B) is actively dividing and contributing to root growth, and the zone of elongation (C) is where cells increase in size to promote root lengthening. Understanding these distinctions helps clarify the functional roles of different root regions in plant development.