Potometers (used to measure transpiration rate) 0.0 / 5 ? BiologyBiological molecules, organic chemistry and biochemistryCellular processesHuman, animal and plant physiologyPractical applications of biologyA2/A-levelAQA Created by: jamey_brewsterCreated on: 18-04-19 09:36 Which 4 conditions must be met to obtain valid results when using a potometer? 1) Fresh & healthy plant shoot 2) Plant shoot must be cut under water 3) No air bubbles in apparatus 4) Leaves must be dry 1 of 5 Why should there be no air bubbles in the potometer? As this would break the chain of water molecules in the xylem vessel, decreasing or preventing transpiration. 2 of 5 Why must the leaves be dry in an experiment on transpiration rate? To prevent water molecules from blocking the stomata (mostly on the underside of the leaf), which would prevent transpiration. 3 of 5 What is used as a measure of the rate of transpiration? Distance moved by the air bubble (as the air bubble is pulled towards the plant by the transpiration stream) 4 of 5 Which 4 independent variables could be tested in a transpiration experiment using a potometer? 1) Temperature 2) Humidity 3) Light intensity 4) Air movement (wind velocity) 5 of 5
Comments
No comments have yet been made