IB Biology HL 3.1.9 Transpiration and Environmental Factors Question Bank

Practise IB Biology HL 3.1.9 through exact HL questions on potometer evidence, environmental variables, experimental controls and plant water transport.

Exam points

Analyse potometer evidence to test how humidity, temperature, light and wind affect transpiration.
Evaluate experimental controls, independent variables and measurements in a transpiration investigation.
Use plant water-transport evidence to connect transpiration loss with xylem movement and environmental gradients.

[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 B3.1.9—Transpiration question 1 — IB Biology HL

Outline how this control set-up could be modified to test the effect of either humidity or temperature on the rate of transpiration.

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B3.1.9—Transpiration question 1