Question

Fig. demonstrates a particular process in plants. Study the same and answer the questions that follow:

1. Name the apparatus.
2. Which phenomenon is demonstrated by this apparatus?
3. Explain the phenomenon mentioned in (b) above.
4. State two limitations of using this apparatus.
5. What is the importance of the air bubble in the experiment?

Answer 1

1. Ganong’s Potometer
2. Transpiration
3. Transpiration is the loss of water as water vapour from the aerial parts of the plant.
4. Two limitations of using Ganong’s Potometer are:
   1. Introducing the air bubble is not very easy.
   2. The twig may not remain fully alive for a long time.
5. The movement of the air bubble gives the volume of water lost in a given time.