B3.2.10—Root tissue distribution
Dicot roots contain central vascular tissue, with lignified xylem, phloem between xylem arms, surrounding cortex and a protective outer epidermis.
- Syllabus
- First assessment 2025
- Objective
- B3.2.10
- Level
- SL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper1A
Typical marks1
Common command terms
- Label
Scoring notes
- Common mistake
- Confusing the central root xylem arrangement with the ring of vascular bundles in stems.
Recent exam appearances
November 2025Paper1A ["SL"] · TZ315[ 1 ]B3.2.10—Root tissue distribution
Practice this objective
Coverage 2025–2025 · Updated 15 Jul 2026
Concept essentials
- Dicot roots have central vascular tissue rather than a ring of separate bundles.
- Xylem commonly forms a central cross or star in dicot roots.
- Phloem occurs between the arms of the root xylem.
- Lignin is found in xylem vessel walls.