Introducing
Your new presentation assistant.
Refine, enhance, and tailor your content, source relevant images, and edit visuals quicker than ever before.
Trending searches
Scientists: Dr. Sydney J. Quintana, Dr. James W. Maddux, Dr, Ashlynn S. Albert
Methods
1. the potometer is immersed in water to remove air bubles
2. the screw clip is opened to fill the capillary tube with water
3. the branch of the plant was cut while in water
4. the cut end of the branch was pushed through the hole of the rubber stopper in the water
5.place a beaker full of water under the end of the capillary tube
Cont.
11. Record the time it was taken for the air bubbles to move from points P to Q
12. The air bubbles were reset at point P by reopening the screw clip
13. Steps 11 & 12 were repeated twice and the mean time was calculated
14. Steps 11-13 were repeated by placing the potometer under a fan of different speeds
The rate of transpiration was calculated using the following formula
Rate of transpiration = P10/t cm/minute
T= time taken for air bubbles to move from P to Q
6. Close the screw clip and remove the potometer from water
7. Wipe the leaves and the stem with tissue paper
8. Put the Vaseline across the joints to ensure that there is no air seeping through
9. Leave the potometer aside until all the air bubbles in the capillary tubes move at a steady pace
10.Put the ruler between point P and point Q along the capillary tube marked 10 cm apart
What is it? Why is it important? Why do we need it?
-An instrument for measuring the amount of water that a plant loses through transpiration, consisting of a sealed vessel of water with a cut inserted so that moisture can escape only through absorption and transpiration
-The function of the cut is to allow an air bubble to travel back to the start of the measuring scale when the experiment is repeated. As water moves up through the plant the air bubble moves along the scale giving a measure of water absorbed by the plant over time and hence the transpiration rate.