In a cross-section of the onion root tip, cell division would be most common among cells in which of the labeled layers?

• A. Maturation zone
• B. Elongation zone
• C. Meristematic zone (just behind the root cap)
• D. Root cap

Answer: (C)

Verified step by step guidance

1. Understand the structure of the onion root tip: The onion root tip is divided into distinct zones, each with specific functions. These zones include the root cap, meristematic zone, elongation zone, and maturation zone.
2. Learn the role of the meristematic zone: The meristematic zone is located just behind the root cap and contains actively dividing cells. This is where mitosis occurs most frequently, as these cells are responsible for growth and development.
3. Contrast the meristematic zone with other zones: The elongation zone is where cells grow in size but do not divide, while the maturation zone is where cells differentiate into specialized types. The root cap protects the root tip but does not participate in cell division.
4. Identify the correct zone for cell division: Since the meristematic zone contains undifferentiated cells undergoing mitosis, it is the zone where cell division is most common.
5. Conclude that the meristematic zone is the correct answer: Based on the functions of the zones, the meristematic zone is the area where cell division is most prevalent in the onion root tip.