Cambridge IGCSE Biology practice
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At a glance
MCQ
Type
cambridge_mcq
Style
Topic
Osmosis
Exam-style question
Why measure the mass of plant tissue before and after immersion in different solutions?.
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Flashcard 1 of 6
Question 1 of 5
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Method
1. Cut potato cylinders of equal size. 2. Measure and record the initial mass of each cylinder. 3. Place each cylinder in a different sucrose solution concentration (0%, 5%, 10%, 15%, 20%) for 30 minutes. 4. Remove cylinders, blot dry, and measure the final mass. 5. Calculate the percentage change in mass for each cylinder.
| Solution concentration (%) | Initial mass (g) | Final mass (g) | Percentage change in mass (%) |
|---|---|---|---|
| 0 | 2.00 | 2.20 | 10 |
| 5 | 2.00 | 2.10 | 5 |
| 10 | 2.00 | 2.00 | 0 |
| 15 | 2.00 | 1.90 | -5 |
| 20 | 2.00 | 1.80 | -10 |
Identify the independent variable in this investigation.
Aim for approximately 1 distinct marking point.
Describe how the percentage change in mass is calculated.
Aim for approximately 2 distinct marking points.
Explain why the potato cylinders lost mass in the 15% and 20% sucrose solutions.
Aim for approximately 3 distinct marking points.