A-LevelBiologyCell membranes and transportMay/June 2023Paper 1 Q191 Mark
An experiment was carried out to investigate the effect of concentration of sucrose solution on cells in a plant tissue. A sample of plant tissue was cut into seven cylinders of equal length and diameter. The mass of each cylinder was recorded. Each of the seven cylinders was put into a different sucrose solution concentration. [Figure 19.1] After two hours, the cylinders were removed, blotted dry and reweighed. The percentage change in mass of each cylinder was recorded. The graph shows the results of this investigation. [Figure 19.2] Which row explains the results if plant tissue cells were put in a sucrose solution of 0.45 mol dm⁻³?
Awater potential of the cytoplasm of the cells at the start of the experiment compared with the water potential of 0.45 mol dm⁻³ sucrose solution: less negative; change in volume of the vacuoles of the cells at the end of the experiment, that were initially placed in 0.45 mol dm⁻³ sucrose solution: decreased
Bwater potential of the cytoplasm of the cells at the start of the experiment compared with the water potential of 0.45 mol dm⁻³ sucrose solution: less negative; change in volume of the vacuoles of the cells at the end of the experiment, that were initially placed in 0.45 mol dm⁻³ sucrose solution: increased
Cwater potential of the cytoplasm of the cells at the start of the experiment compared with the water potential of 0.45 mol dm⁻³ sucrose solution: more negative; change in volume of the vacuoles of the cells at the end of the experiment, that were initially placed in 0.45 mol dm⁻³ sucrose solution: decreased
Dwater potential of the cytoplasm of the cells at the start of the experiment compared with the water potential of 0.45 mol dm⁻³ sucrose solution: more negative; change in volume of the vacuoles of the cells at the end of the experiment, that were initially placed in 0.45 mol dm⁻³ sucrose solution: increased
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The correct answer is A. This question tests the candidate's understanding of cell membranes and transport within the Biologysyllabus. The examiner's mark scheme requires...
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