Cambridge IGCSE Biology practice
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At a glance
MCQ
Type
cambridge_mcq
Style
Topic
Diffusion
Exam-style question
Which factor increases diffusion rate by providing more area for particles to move across?.
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Common mistake
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Flashcard 1 of 6
Question 1 of 5
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Method
1. Fill three beakers with equal volumes of water at different temperatures: 10°C, 25°C, and 40°C. 2. Add a small crystal of dye to the center of each beaker at the same time. 3. Measure the time taken for the dye to spread across a fixed distance in each beaker. 4. Repeat the experiment three times for each temperature and calculate the average time.
| Temperature (°C) | Time for dye to spread (s) |
|---|---|
| 10 | 120 |
| 25 | 80 |
| 40 | 50 |
Identify the independent variable in this investigation.
Aim for approximately 1 distinct marking point.
Describe how the rate of diffusion changes with temperature based on the results.
Aim for approximately 2 distinct marking points.