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Measurement of transpiration rates using potometers

Experiments

Here are experiments our science specialists have selected to support the IB* topic.

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Transpiration

Experiment #10 from Biology with Vernier

In this experiment, you will

  • Observe how transpiration relates to the overall process of water transport in plants.
  • Use a Gas Pressure Sensor to measure the rate of transpiration.
  • Determine the effect of light intensity, humidity, wind, and temperature on the rate of transpiration of a plant cutting.

Recommended

Transpiration of Plants

Experiment #13 from Investigating Biology through Inquiry

In this Preliminary Activity, you will use a Gas Pressure Sensor to measure transpiration rates under different conditions. The data will be collected by measuring pressure changes as the plant takes up water into the stem.

After completing the Preliminary Activity, you will first use reference sources to find out more about transpiration before you choose and investigate a researchable question dealing with transpiration rate. Some topics to consider in your reference search are:

  • transpiration
  • cohesion-tension theory
  • water potential
  • osmosis
  • stomata
  • water potential gradient
  • xylem
  • mesophyll cell

Educational Standard
International Baccalaureate (IB)
Subject
Biology
Section
Prescribed Practicals
Topic
9.1 Transport in the Xylem of Plants

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.

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