The diagram shows a potometer.
A student wants to test the hypothesis that the number of stomata on a plant affects water loss.
They first record the distance the gas bubble moves in 10 minutes.
What should the student do next before taking a second reading to test this hypothesis?
1 )
Cover the plant with a black plastic bag.
Remove some of the leaves.
3 )
Repeat the test in a warmer room.
4 )
Use an electric fan to move the air.
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