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AQA GCSE · Question 06.4 · Bioenergetics
Give the independent variable and the dependent variable in this investigation.
Give the independent variable and the dependent variable in this investigation.
How to approach this question
**Independent variable:** This is the one factor that the scientist deliberately changes to see what effect it has.
**Dependent variable:** This is the factor that the scientist measures to see if it has been affected by the change they made.
Full Answer
Independent variable: Colour of light.
Dependent variable: Time taken for 10 leaf discs to reach the surface.
In a scientific investigation:
* The **independent variable** is the one that is changed or manipulated by the investigator to test its effect. In this experiment, the student is changing the colour of the light.
* The **dependent variable** is the one that is measured to see the outcome of the change. In this experiment, the student is measuring the time it takes for the leaf discs to rise, which is an indirect measure of the rate of photosynthesis.
Common mistakes
✗ Mixing up the independent and dependent variables.
✗ Listing a control variable (e.g., light intensity, temperature) instead of the independent or dependent variable.
Practice the full AQA GCSE Biology Higher Tier Paper 1
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