February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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32Plant Structure TransportHard1 mark
The diagram shows a model that can be used to demonstrate mass flow in phloem. Tube T represents the phloem.
Diagram of a model apparatus: two rigid, partially permeable containers, X (containing concentrated sucrose solution) and Y (containing dilute sucrose solution), both submerged in a water bath and connected to each other by tube T at the top
Water moves in or out of X and Y either as a result of osmosis or as a result of hydrostatic pressure. Sucrose solution then moves through tube T that joins X and Y.
Which description is correct?
water potential in X compared with Ydirection of movement of sucrose solution in tube T
Aless negativefrom X to Y
Bless negativefrom Y to X
Cmore negativefrom X to Y
Dmore negativefrom Y to X