Question

Enlist the laminations of use of the potometer.​

Answer 1

Answer:

Limitations. 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.

Answer 2

Limitations in the use of potometer

• Introducing the air bubble is not very easy.
• The twig may not remain fully alive for a long time.
• Any changes in the outside air temperature may affect the position of the air bubble in the capillary tube.

Extra Information:

There are number of methods for measuring transpiration:

• Weighing method
• Potometer method

Weighing method:

A small lightweight potted plant can be weighed before and after the end of a certain period of time. For it the soil surface and the pond should be fully covered to prevent evaporation from the surface is other than the plant. The loss of weight by the plant during that time is due to the loss of water by transpiration.

Potometer method:

Potometer is a device that measures the rate of water intake by a plant, and this water intake is almost equal to the water loss through transpiration.