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CAIE A-Level Biology 7.1.2 Distribution of Xylem and Phloem

Practise locating xylem and phloem in dicot root, stem and leaf sections using central root xylem, stem vascular bundles and upper-to-lower leaf-bundle orientation.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • identify central star-shaped xylem with phloem between its arms in a dicot root
  • locate xylem towards the inside and phloem outside within stem vascular bundles
  • orient leaf-bundle xylem towards the upper surface and phloem towards the lower surface

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