7.7- Measurement of water uptake using a potometer

Created by: Megan2413
Created on: 16-03-17 09:33

How is the equipment set up?

- Leafy shoot cut under water - Potometer is filled up with water, making sure there are no air bubbles - The shoot is fit into the potometer under water using a rubber tube - Potometer is emoved from under water and all joints are sealed

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Why must water not be gotten onto the leaves when set up?

This would increase the water potential outside the leaf and decrease the water potential gradient between the inside of the leaf and environment, hence slow the rate of transpiration

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Why are all joints sealed?

So that no other air bubbles can be introduced into the experiment except the one you are following

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How is the experiment undergone?

An air bubble is introduced into the capillary tube by opening the tap and pushing the syringe - The distance moved by the air bubble in a given time is measured a number of time and the mean is calculated

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How is the volume of water uptake calculated from your results?

The volume of water lost against the time in minutes can be plotted on a graph and as 99% of water taken up by a plant is lost in transpiration, the rate of uptake is practically the same as the rate of transpiration

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Other cards in this set

Card 2

Front

Why must water not be gotten onto the leaves when set up?

Back

This would increase the water potential outside the leaf and decrease the water potential gradient between the inside of the leaf and environment, hence slow the rate of transpiration

Card 3

Front

Why are all joints sealed?

Back

Card 4

Front

How is the experiment undergone?

Back

Card 5

Front

How is the volume of water uptake calculated from your results?

Back

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7.7- Measurement of water uptake using a potometer