A student uses a potometer to measure water uptake in a leafy plant shoot.
They want to test the hypothesis that the leaf surface area of a plant shoot affects the rate of transpiration (water loss).
They first record the distance the gas bubble moves in 15 minutes15\text{ minutes}15 minutes.
What should the student do next before taking a second reading to test this hypothesis?
Wrap the leaves in a transparent plastic bag.
Remove some of the leaves from the shoot.
Place a fan next to the plant to increase airflow.
Spray the leaves with a fine mist of water.
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.