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Cambridge IGCSE Biology practice

What is a suitable way to measure the rate of photosynthesis in a lab?

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MCQ

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cambridge_mcq

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Topic

Photosynthesis

Exam-style question

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What is a suitable way to measure the rate of photosynthesis in a lab?.

  1. A.Counting oxygen bubbles produced
  2. B.Measuring leaf size
  3. C.Recording temperature changes
  4. D.Measuring soil moisture

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Paper 6 structured question: Photosynthesis

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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]