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IB Biology HL 3.2.7 Water Transport in Plants Question Bank

Practise IB Biology HL 3.2.7 by linking water properties, xylem structure, cohesion and transpiration pull from roots to leaves.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain cohesion-tension transport using xylem, water polarity and transpiration pull.
  • Use root uptake, xylem structure and pressure changes to trace water to leaves.

B3.2.7—Water transport in plants question 1

[Maximum number: 2]

The rate of transpiration can be measured using a data-logging pressure sensor connected to a plant cutting via a plastic tube. In an experiment, a control set-up was connected to the tube and placed in a well-lit room with normal humidity levels.

Figure for Question B3.2.7—Water transport in plants question 1 — IB Biology HL

Predict, with a reason, what will happen to the pressure in this tube as transpiration occurs.

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