22.2.1 Select and safely use techniques and apparatus question 1
Some students set up the apparatus shown in Fig. 6.1 to compare transpiration in two sets of leaves.
Set A was kept in a transparent bag and set B was left in the open air.
All other conditions were kept constant.
The mass of the leaves in each set was measured at the start of the investigation and after five hours.
Fig. 6.1
The students needed two additional pieces of apparatus to take measurements so that they could calculate the rate of transpiration from their results.
State the two additional pieces of apparatus the students needed to take the measurements.
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