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Learning objective

Investigate and explain how varying light intensity, carbon dioxide levels, and temperature influence the rate of photosynthesis.

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  • Practise with linked questions.
Cambridge IGCSE BiologyPlant nutritionCore contentPractical objective

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Quick explanation

Investigate and explain how varying light intensity, carbon dioxide levels, and temperature influence the rate of photosynthesis

  • This point belongs to Photosynthesis, especially Photosynthesis outcomes.
  • You need to be able to investigate and explain how varying light intensity, carbon dioxide levels, and temperature influence the rate of photosynthesis.
  • The key ideas to know are Describe and Investigate.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

DescribeInvestigate

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This objective helps connect Photosynthesis outcomes to exam-style questions, flashcards, and revision notes for Photosynthesis.

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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]
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