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AQA A-Level Biology Required Practical 3: Production of a dilution series to identify the water potential of plant tissue Exam Style Questions
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What is the purpose of calibration curves?
What is the purpose of calibration curves?
They are used to determine the concentration of an unknown sample by comparing it to a set of standard values with known concentrations
Why is the percentage change used rather than the actual change in mass?
Why is the percentage change used rather than the actual change in mass?
- Potato chips may not all have same starting mass.
- Percentage change allows comparison.
Explain the change in mass in the potato chips
Explain the change in mass in the potato chips
- The potato chips with concentration lower than the sucrose solution (higher water potential) lose mass as there is a net movement of water out of the cells.
- The potato chips with concentration higher than the sucrose solution (lower water potential) gain mass as there is a net movement of water into the cells
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