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GCSE Biology · key term
An apparatus that measures the rate at which a cut leafy shoot takes up water.
Used by AQA, Edexcel and OCR
Specification 4.2.3.2 · Paper 1
Apparatus that estimates a plant shoot's rate of water uptake, often by tracking an air bubble in a narrow tube.
Revise: Factors and Calculations of Transpiration RateA potometer follows water taken up by a leafy shoot. Cut the shoot under water to avoid drawing air into its xylem, then fit it into water-filled apparatus with a narrow capillary tube. Introduce an air bubble into the tube.
Specification 6.12, 6.13 · Paper 2
Revise: Factors Affecting Water UptakeA bubble potometer contains a cut leafy shoot connected to water-filled tubing and a narrow capillary tube. As the shoot takes up water, an air bubble moves along the capillary. Greater movement in a given time indicates faster water uptake.
Apparatus that measures water uptake by a leafy shoot, allowing transpiration rate to be estimated.
Specification B2.2j · Paper 1 (Foundation), Paper 3 (Higher)
A device used to measure the rate at which a leafy shoot takes up water.
Revise: PotometerA potometer measures the rate of water uptake by a leafy shoot.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
An apparatus that measures how quickly a plant shoot takes up water, usually by tracking an air bubble in a water-filled capillary tube.
Revise: Investigating Transpiration: The PotometerA simple potometer follows the water taken up by a leafy shoot: it does not collect or directly measure the water vapour leaving the leaves.
An apparatus that measures how quickly a leafy shoot takes up water.
A device that measures the rate at which a plant shoot takes up water.
A device that measures water uptake by a cut plant shoot.
A potometer measures water uptake, which is used to estimate transpiration; it does not directly measure water vapour leaving the leaves.
Do not say that a potometer directly measures transpiration. It measures water uptake, which is used to estimate transpiration.
State that a potometer measures water uptake; it estimates transpiration rather than measuring water loss directly.
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