Measuring Transpiration

You can estimate the rate of transpiration by using a potometre and measuring the uptake of water by a plant. If you assume that the uptake of water is equal to the water loss by tramspiration.

You can use a potometer to measure the distance a bubble moves along a cappillary tube, it will move when water is being taken up by the plant.

Guard cells are adapted to open and close stomata:

• Shaped like a kidney which opens and closes.
• When the plant has lots of water…