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Cambridge IGCSE Biology practice

Paper 6 structured question: Water uptake

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6

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3

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Topic

Water uptake

Exam-style question

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Paper 6Alternative to PracticalPractical3 marks

A student investigated water movement in a plant by placing a stem in coloured dye and measuring how far the dye travelled after different times.

Results Table

Results

Distance dye travelled up stem (cm)

Time (minutes)Distance (cm)
102
204
306
408
  1. a

    Explain why the dye moves up the stem over time.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Suggest one control variable the student should keep constant during the investigation.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 6 structured question: Water uptake

Paper 6Alternative to PracticalPractical3 marks

Method

Method

1. A leafy stem was cut under water and placed in a beaker containing coloured dye solution. 2. The plant was left in the dye for 2 hours. 3. After 2 hours, the stem was cut open and examined for the presence of dye. 4. The distance the dye had travelled up the stem was measured.

  1. a

    Identify the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how you would improve the accuracy of the measurement of dye movement in this investigation.

    Aim for approximately 2 distinct marking points.

    [2]