How do you calculate water loss rate?
The rate of transpiration can be calculated by measuring the distance travelled by an air bubble in a capillary tube over a given time. The faster the bubble moves, the greater the rate of water uptake – and so the greater the assumed rate of transpiration.
How do you measure using a potometer?
A simple potometer is a piece of capillary tubing to which a plant has been connected. The water uptake is measured by recording the time taken for a bubble in the tube to move a set distance….Example results.
| Time in minutes | Distance moved by bubble in mm |
|---|---|
| 25 | 80 |
| 30 | 95 |
What is potometer used for?
A potometer’ (from Greek ποτό = drunken, and μέτρο = measure), sometimes known as transpirometer, is a device used for measuring the rate of water uptake of a leafy shoot which is almost equal to the water lost through transpiration. The causes of water uptake are photosynthesis and transpiration.
How do you set up a potometer?
Setting up:
- Cut a leafy shoot from a plant (e.g. Pelargonium) and plunge its base into water (try not to get any water on the leaves).
- Back in the laboratory, put the stem into a large sink full of water and carefully trim the shoot again, by cutting off the bottom under water with a sharp razor blade.
What is weighing method of transpiration?
Complete answer:Weighing method is a method to check transpiration in which a small lightweight potted plant can be weighed before and after the end of a certain period of time. The soil surface and the pot should be fully covered to prevent evaporation from the surfaces other than the plant.
What is the meaning of potometer?
Definition of potometer : an apparatus for measuring the rate of transpiration in a plant by determining the amount of water absorbed.
How do you set a potometer for volume?
Method
- Cut a shoot underwater.
- Place the shoot in the tube.
- Set up the apparatus as shown in the diagram.
- Make sure it is airtight, using vaseline to seal any gaps.
- Dry the leaves of the shoot.
- Remove the capillary tube from the beaker of water to allow a single air bubble to form and place the tube back into the water.
Which is the instrument used to measure transpiration?
potometer
The instrument used for measuring the rate of transpiration is called a potometer.
What are the different types of potometer?
There are 2 types of potometer – the bubble potometer and the weight potometer.