Where does cell division primarily occur in a root?

• A. At the root tip
• B. In the apical meristem
• C. Along the root hairs
• D. At the lateral roots

Answer: (B)

Cell division primarily occurs in the apical meristem, which is located at the root tip. The apical meristem is a region containing undifferentiated cells that rapidly divide to produce new cells. This process contributes to the elongation of the root and the growth of additional root structures. The cells produced in the apical meristem are responsible for the development of various root tissues and root hair formation, which is essential for nutrient and water absorption.

While the root tip does encompass the apical meristem, stating that cell division occurs solely "at the root tip" is not encompassing enough, as it doesn’t specify the particular tissue responsible for this activity. Additionally, the root hairs do not participate in cell division; instead, they are extensions of root epidermal cells that help facilitate water and nutrient uptake. Similarly, lateral roots develop from pericycle cells after initial division events, but they are not the primary site of cell division themselves. Therefore, the best answer indicating where cell division mainly occurs is indeed in the apical meristem.