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Cambridge IGCSE Combined Science practice

Paper 6 structured question: Photosynthesis

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Photosynthesis

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Paper 6Alternative to PracticalPractical5 marks

Analyzing results from an experiment on photosynthesis.

Results Table

Results of Photosynthesis Experiment

The table shows the effect of carbon dioxide concentration on the rate of photosynthesis measured by oxygen production.

Carbon Dioxide Concentration (%)Oxygen Production (ml/min)
0.042
0.084
0.126
0.168
  1. a

    Describe the trend shown in the results.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Explain why carbon dioxide is important for photosynthesis.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 6 structured question: Photosynthesis

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Method

Method to Investigate Photosynthesis

1. Set up a beaker with water and a sprig of Elodea. 2. Place a lamp at varying distances from the beaker. 3. Count the number of oxygen bubbles produced in one minute at each distance.

Distance from lamp (cm)Number of bubbles produced
1015
2010
305
  1. a

    State the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]