Biology Topic Practice
Investigating Transpiration Rate
Using a piece of equipment called a potometer, we can measure how fast a plant loses water.
How would you simulate a "windy" day in this practical?
What is Investigating Transpiration Rate?
"A potometer is a device used to estimate the rate of transpiration by measuring the water uptake of a plant."
Question 1
What is transpiration?
Question 2
Which set of conditions would usually increase the rate of transpiration?
Question 3
Why does high humidity reduce transpiration?
Using a Potometer
As the leaf loses water, the air bubble moves along the tube.
Distance moved per minute = rate of transpiration.
Change environmental factors (light, heat, wind) to see the effect.
Exam Tip
The potometer actually measures water uptake, but this is used as a proxy for water loss.
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