A set up that was used to investigate a certain process in plants as shown in the diagram below.

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a) What process was being investigated?

(Rate of) transpiration


i) State two precautions that should be taken when setting up the experiment.

  • Cut shoot under water
  • Apply petroleum jelly to cork-glass/Bung-glass/Bung-shoot connection
  • Open reservoir tap

ii) Give a reason for each precaution stated in b(i) above.

  • To ensure no air enters leafy shoot/xylem
  • To ensure the apparatus is air tight
  • To remove air bubbles from tubes

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