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CAIE IGCSE Biology 8.2.4 Investigating the Water Pathway With Stain

Practise interpreting stain investigations that show coloured dye moving through xylem in stems, then connect passive water flow to dead xylem vessels.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • use blue dye in celery or stem sections to identify xylem as the water pathway
  • explain unchanged flow after toxic treatment because xylem is dead and water flow is passive

8.2.4—Investigate, using a suitable stain question 1

[Maximum number: 1]

A celery stalk was placed into a beaker of blue dye. When the dye reached the leaves, the stalk was taken out and a section was cut, as shown in the diagram.

Figure for Question 8.2.4—Investigate, using a suitable stain question 1 — CAIE IGCSE Biology
Figure for Question 8.2.4—Investigate, using a suitable stain question 1 — CAIE IGCSE Biology

Which diagram shows the appearance of the cut end of the stalk?

A
Figure for Question 8.2.4—Investigate, using a suitable stain question 1 — CAIE IGCSE Biology — Option A
B
Figure for Question 8.2.4—Investigate, using a suitable stain question 1 — CAIE IGCSE Biology — Option B
C
Figure for Question 8.2.4—Investigate, using a suitable stain question 1 — CAIE IGCSE Biology — Option C
D
Figure for Question 8.2.4—Investigate, using a suitable stain question 1 — CAIE IGCSE Biology — Option D
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