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Cambridge IGCSE Biology practice

Paper 6 structured question: Photosynthesis

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6

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Topic

Photosynthesis

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Paper 6Alternative to PracticalPractical3 marks

Studying how temperature affects photosynthesis rate in a water plant.

Results Table

Photosynthesis Rate at Different Temperatures

The table shows the number of oxygen bubbles produced per minute by a water plant at different temperatures.

Temperature (°C)Oxygen bubbles per minute
105
2015
3025
4010
502
  1. a

    Describe the pattern shown by the data.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain why the rate decreases at temperatures above 30°C.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Photosynthesis

Paper 6Alternative to PracticalPractical3 marks

Method

Method to Investigate Light Intensity Effect on Photosynthesis

1. Place a water plant (e.g., Elodea) in a beaker of water. 2. Position a lamp at a set distance from the plant. 3. Count the number of oxygen bubbles produced in one minute. 4. Repeat the count three times and calculate the average. 5. Move the lamp closer to the plant and repeat steps 3 and 4. 6. Keep temperature and carbon dioxide concentration constant throughout.

  1. a

    Identify the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how you would ensure a fair test in this investigation.

    Aim for approximately 2 distinct marking points.

    [2]