Cambridge IGCSE Biology practice
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At a glance
MCQ
Type
cambridge_mcq
Style
Topic
Osmosis
Exam-style question
Which of the following is a control variable in the osmosis experiment?.
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Common mistake
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Flashcard 1 of 6
Question 1 of 5
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Method
1. Cut equal lengths of dialysis tubing and soak in water to soften. 2. Tie one end of each tubing to form a bag. 3. Fill each bag with 10 cm³ of sugar solution at different concentrations (0%, 10%, 20%, 30%). 4. Tie the open end securely. 5. Blot dry and weigh each bag. 6. Place each bag in separate beakers containing 100 cm³ distilled water. 7. Leave for 30 minutes at room temperature. 8. Remove bags, blot dry, and weigh again. 9. Record the change in mass for each bag.
| Sugar concentration (%) | Initial mass (g) | Final mass (g) | Change in mass (g) |
|---|---|---|---|
| 0 | 5.0 | 5.5 | +0.5 |
| 10 | 5.1 | 5.4 | +0.3 |
| 20 | 5.0 | 5.0 | 0 |
| 30 | 5.2 | 5.0 | -0.2 |
Identify the independent variable in this investigation.
Aim for approximately 1 distinct marking point.
Describe how you would measure the dependent variable in this investigation.
Aim for approximately 2 distinct marking points.