Table of Contents
- 1 How do you calculate the rate of water movement?
- 2 How does wind speed affect the rate of transpiration experiment?
- 3 Why does a potometer not measure transpiration?
- 4 Does the potometer method actually measure transpiration?
- 5 What is the purpose of the air bubble in a potometer?
- 6 What is a potometer measuring?
- 7 How is the rate of water uptake measured in A potometer?
- 8 What kind of Potometer do you use to measure transpiration?
How do you calculate the rate of water movement?
The uptake of water can be measured using a potometer. Under normal circumstances, the rate of water uptake gives a measure of the rate of transpiration . A simple potometer is a piece of capillary tubing to which a plant has been connected….Example results.
| Time (min) | Distance moved by bubble (mm) |
|---|---|
| 5 | 16 |
| 10 | 32 |
| 15 | 47 |
| 20 | 64 |
How does wind speed affect the rate of transpiration experiment?
Factors that affect the rate of transpiration also affect water uptake by the plant….Factors affecting rate.
| Factor | Effect | Explanation |
|---|---|---|
| Wind speed | Increased | Moving air removes water vapour, increasing the rate of diffusion of water vapour from the leaf |
How does a bubble potometer work?
Bubble potometer As water is transpired from the leaves, the shoot absorbs water from the potometer. The distance the air bubble moves in a certain period of time can be used to calculate the rate of water uptake. The apparatus is set up under water to prevent the entry of any unwanted air bubbles.
Who invented potometer?
The Potometer was invented by Ganong. The phenomenon which is measured using a potometer was first observed by scientist Stephen Hales who was an English botanist. Complete answer: Potometer is a device also known as transpirometer is used for measuring transpiration by measuring the rate of water absorption by plants.
Why does a potometer not measure transpiration?
The potometer does not measure the rate of transpiration accurately because not all of the water that is taken by the plant is used for transpiration (water taken might be used for photosynthesis or by the cells to maintain turgidity). The potometer measures the rate of uptake of water.
Does the potometer method actually measure transpiration?
How do you stop air bubbles in a potometer?
1. Cut the shoot under water to prevent air bubbles entering the xylem of the stem and ensure the cut is diagonal to increase the surface area available for water uptake. 2. Place the cutting in the potometer and seal with Vaseline to ensure no air enters the system.
What is the role of air bubble in potometer?
The air bubble in Ganong’s potometer is to mark the progress of transpiration and absorption of water by the freshly cut leafy twig which must be devoid of any roots. A photometer is a device which is used to measure the rate of water uptake by the plant.
What is the purpose of the air bubble in a potometer?
What is a potometer measuring?
A potometer can be used to measure the rate of transpiration that’s proportional to water uptake. The potometer is set up underwater to avoid unwanted air bubbles in the xylem of the plant which may disrupt the transpiration stream.
How does a bubble potometer work under water?
Bubble potometer As water is transpired from the leaves, the shoot absorbs water from the potometer. The distance the air bubble moves in a certain period of time can be used to calculate the rate of water uptake. The apparatus is set up under water to prevent the entry of any unwanted air bubbles.
What do you need to know about A potometer?
A potometer is a piece of apparatus designed to measure water uptake in a leafy shoot. There are 2 types of potometer – the bubble potometer and the weight potometer. As water is transpired from the leaves, the shoot absorbs water from the potometer.
How is the rate of water uptake measured in A potometer?
As water is transpired from the leaves, the shoot absorbs water from the potometer. The distance the air bubble moves in a certain period of time can be used to calculate the rate of water uptake. The apparatus is set up under water to prevent the entry of any unwanted air bubbles.
What kind of Potometer do you use to measure transpiration?
In this practical, students use a potometer to measure the rate of transpiration. There are two main types of potometer used in schools – the mass potometer, which measures transpiration through the loss of mass, and the moving-bubble potometer, which measures water uptake by the shoot.