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

Snap 2023 03 16 at 20.07.16

a) What process was being investigated?

(Rate of) transpiration

b)

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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