Select suitable apparatus and measurement techniques, record observations accurately and control variables when interpreting practical investigations in Cambridge A Level Biology questions.
The table shows the volume of water taken up over a 10 minute period for two species of plant, X and Y .
Both plants were tested at the same time, in the same room and using identical potometers. A student concluded that Y was a xerophyte so lost less water.
What feature of the experiment could bring this conclusion into doubt?
The student did not control air flow or temperature surrounding the plants.
The student did not leave the plants to acclimatise to their surroundings.
The student did not take measurements at 0 minutes.
The student did not take account of the area of leaves.