Question

The diagram of an apparatus given below demonstrates a particular process in plants. Study the same and answer the questions that follows


What is the importance of the air bubble in this experiment?

Answer 1

• The rate of transpiration can be calculated by measuring the distance travelled by an air bubble in a capillary tube over a given time.
• Transpiration creates a suction force that pulls the water from the beaker and the air bubble in the capillary tube moves along.
• This air bubble can be brought back to its original position by releasing some water from the reservoir into the capillary tube.
• The air bubble is used for demonstrating the transpiration pull.