Question

The inference in Ganong's potometer is that the

• A. Rise in mercury in the tube indicates the suction created by transpiration
• B. Water test by transpiration has created a suction force which pulls the water from the beaker and the bubble in the mercury
• C. Both A and B
• D. None of the above

Answer 1

Answer: (B)

Water test by transpiration has created a suction force which pulls the water from the beaker and the bubble in the mercury

In Ganong's Potometer the plant has a transpiration pull generated which causes a suction force. This suction force is the driving force here. It pulls the water from the beaker as well as the bubble. Only one bubble is created carefully and the distance moved by the bubble is scaled. This gives us the measure of uptake of water by the plant.

So the correct answer is 'Water test by transpiration has created a suction force which pulls the water from the beaker and the bubble in the mercury'.