CAIE A-Level Biology AS 7.1.2 Xylem and Phloem Distribution Questions
Explain xylem and phloem distribution in plant organs using evidence from each question and mark scheme.
- Syllabus
- 2028–2030
- Course
- Biology 9700
- Level
- AS
Exam points
- Explain the distribution of xylem and phloem in roots, stems and leaves.
CAIE A-Level Biology AS 7.1.2 Xylem and Phloem Distribution Questions question 1
Water and mineral ions are transported up the stem of a plant to the leaves within xylem vessels.
Some water and mineral ions can pass out of xylem vessel elements to supply parenchyma tissue in the stem.
Fig. 1.1 is a plan diagram of a section through a stem.
Fig. 1.1
Identify one location where xylem tissue occurs in the stem by drawing a label line and the letter X on Fig. 1.1.
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