The diagrams illustrate an experiment about transpiration. Four leaves from the same species are balanced on two drinking straws. Grease is applied to one side of each leaf, or to both sides. If their masses are not equal, the heavier end moves down. Initially, the straws were arranged so that the leaves were level. Which leaves will be lower after an hour?
- A1 and 3
- B1 and 4
- C2 and 3
- D2 and 4