A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2016 · Q281 Mark
The diagram shows a model to demonstrate mass flow. In a plant, what are the structures W, X, Y and Z and what is the direction of flow of solution along W? [Figure 28.1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Aphloem: W, xylem: X, roots: Y, leaves: Z, direction of flow along W: from Z to Y
Bphloem: W, xylem: X, roots: Z, leaves: Y, direction of flow along W: from Y to Z
Cphloem: X, xylem: W, roots: Y, leaves: Z, direction of flow along W: from Y to Z
Dphloem: X, xylem: W, roots: Z, leaves: Y, direction of flow along W: from Z to Y
✓ Correct answer
B: phloem: W, xylem: X, roots: Z, leaves: Y, direction of flow along W: from Y to Z
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