A student cuts cylinders from a cauliflower stalk and records the initial mass of each cylinder. The cylinders are placed in tubes containing different concentrations of sucrose solution. After 30 minutes, the student measures the final mass of each cylinder.
Which action controls the temperature of the sucrose solutions?
Stand all of the tubes together in the same place.
Cut every cylinder to the same length before weighing it.
Blot each cylinder once before measuring its final mass.
Add the same volume of sucrose solution to every tube.
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.