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Cambridge IGCSE Biology practice

Paper 6 structured question: Sexual reproduction in plants

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Attempt questionSexual reproduction in plants revisionRevise the key idea

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Topic

Sexual reproduction in plants

Exam-style question

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Paper 6Alternative to PracticalPractical4 marks

Results from an experiment testing seed germination at different temperatures.

Results Table

Seed Germination at Different Temperatures

Number of seeds germinated out of 10 after 3 days

Temperature (°C)Number of seeds germinated
52
157
259
354
  1. a

    Describe the effect of temperature on seed germination shown in the table.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Suggest why fewer seeds germinated at 35°C than at 25°C.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Sexual reproduction in plants

Paper 6Alternative to PracticalPractical3 marks

Method

Method to Investigate Seed Germination

1. Place 10 seeds on moist filter paper in a Petri dish. 2. Keep the Petri dish in a warm place (25°C). 3. Observe and record the number of seeds that germinate after 3 days. 4. Repeat the experiment with seeds kept in a cold place (5°C). 5. Ensure all other conditions (water, oxygen) are the same.

  1. a

    Identify the independent variable in this investigation.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how you would ensure that oxygen is available to the seeds during the experiment.

    Aim for approximately 2 distinct marking points.

    [2]