What precaution will you take while handling the potometer?
A tube for holding the shoot. The shoot must be held in contact with the water; additionally, the surface of the water should not be exposed to the air. Otherwise, evaporation will interfere with measurements. A rubber bung greased with petroleum jelly suffices.
What are the three limitations in use of potometer?
Limitations Of Ganong’s Potometer The twig placed on the glass cylinder might not stay alive for a longer time. The introduction of an air bubble in the horizontal bar is very difficult and time-consuming. A slight change in the atmospheric temperature might affect the position of the air bubble.
How long should you leave a potometer for?
Leave undisturbed for 5 minutes or until the shoot equilibrates to the conditions.
Why might a potometer fail to work?
It is crucial to avoid air bubbles in the assembled potometer. This is the most common reason for potometer failure.
Why is it important that the leaves are dry when using a potometer?
The potometer will not work properly until any excess water on the leaves has evaporated or been removed.
What are the factors that affect transpiration?
Factors affecting transpiration
- temperature.
- humidity.
- air movement.
- light intensity.
Which of the following is not a limitation of potometer?
So the correct answer is ‘Water retained by plants is neglected’.
What are the factors that affect the rate of transpiration?
The rate of transpiration is affected by several factors, including:
- temperature.
- humidity.
- wind speed.
- light intensity.
Why should the shoot be cut under water?
The reason we cut it under water is to prevent air bubbles entering the xylem vessel. You must use a very sharp knife or new scalpel and cut at an angle in order to increase surface area for water uptake in the xylem. Florists who cut plants before immersing them in water follow the same procedure for this reason.
What are the factors affecting the rate of transpiration?
Why is it important that no air bubbles enter the potometer?
By changing the surrounding atmospheric conditions, the effect on transpiration of wind, heat, and humidity can be measured. Potometers are notoriously difficult to set up, because air bubbles in the xylem of the plant or in the apparatus itself will prevent the device from working properly.
What are 3 factors that affect the rate of transpiration?
What assumption is made when using a potometer?
State what assumptions must be made if a potometer is used to measure the rate of transpiration. You would have to assume that all water taken up is transpired.
What are the limitations in use of photometer?
Answer: 1) Introducing the air bubble is not very easy. 2) The twig may not remain fully alive for a long time. 3) Any changes in the temp of atmosphere may affect the position of the air bubble in the capillary tube.
What are the best conditions for transpiration?
Factors affecting transpiration
| Factor | Change in factor that increases transpiration rate |
|---|---|
| Temperature | Increase |
| Humidity | Decrease |
| Air movement | Increase |
| Light intensity | Increase |
Why do you cut a shoot at a slant?
Cut the stem of the leafy shoot (at an angle to increase the surface area) under water . The reason we cut it under water is to prevent air bubbles entering the xylem vessel. You must use a very sharp knife or new scalpel and cut at an angle in order to increase surface area for water uptake in the xylem.
Why do we dry leaves in potometer?
If air gets into the xylem vessels of the plant, it can form air locks which will prevent the plant taking up water and so prevent steady transpiration. 3 The potometers should be left for the leaves to dry. Alternatively dry the leaves gently with a paper towel.
Why does temperature affect transpiration?
Higher temperatures mean water molecules evaporate at a faster rate which increases the rate of transpiration.
Can the conditions of the potometer be changed during a test?
The conditions of the potometer, other than the alteration that is being tested, should not be changed during a test, as outside conditions (for example, temperature) determine water uptake. Read more about this topic: Potometer
What is the use of A potometer?
Ganongs Potometer is a device used to measure the water uptake in transpiration. The transpiration rate is calculated by taking the gap included by using the air bubble in a fixed time period.
What precautions should be taken while lying down after a hip replacement?
Hip Precautions While Lying Down 1 Don’t cross your legs at any time 2 Don’t pull your knees towards your chest. 3 Don’t let the toes of your affected leg turn inward. 4 Don’t lie on the side of your hip replacement. 5 Don’t lean forward when resting in bed i.e. 6 Do sleep on your back with a pillow between your legs.
Do I need to acclimatise my potometer?
Sorry this is a 1 year late, but I’m pretty sure that you need it to acclimatise so the rate of water uptake measured by the potometer is caused by the conditions the potometer is in.