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Cambridge IGCSE Combined Science practice

Paper 6 structured question: Transpiration

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6

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3

Marks

Topic

Transpiration

Exam-style question

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Paper 6Alternative to PracticalPractical3 marks

Examining the impact of wind speed on transpiration rates.

Results Table

Results of Transpiration Experiment

The table shows the rate of transpiration at different wind speeds.

Wind Speed (m/s)Transpiration Rate (ml/h)
01
23
45
67
  1. a

    Explain how wind speed affects the rate of transpiration based on the results.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 6 structured question: Transpiration

Paper 6Alternative to PracticalPractical1 marks

Method

Method for Measuring Transpiration

1. Set up a potometer with a plant shoot. 2. Place the potometer in a controlled environment chamber. 3. Adjust the temperature of the chamber. 4. Measure the distance the water level in the potometer falls over a set time period at different temperatures.

Temperature (°C)Water Loss (cm)
202
254
306
358
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]