The structure formed due to elongation of the radicle is which of the following?

• A. Secondary root
• B. Adventitious root
• C. Primary root
• D. Tap root system

Answer: (C)

When the seed begins to grow, the first root that emerges is the radicle. As it lengthens, it becomes the primary root, the main root that forms the initial root axis of the plant. This primary root can then give rise to lateral roots, building the typical root system seen in many plants. Adventitious roots arise from non-root tissues like stems or leaves, so they’re not formed directly by elongation of the radicle. Lateral or secondary roots are small roots that branch off the primary root after it has formed. The term tap root system describes the overall organization centered on the primary root and its lateral roots, not the immediate product of radicle elongation itself.