Biology A (Salters-Nuffield) A-Level
Controlled variables
What Controlled variables means in Biology A (Salters-Nuffield) A-Level, as defined for Pearson Edexcel.
Definition of Controlled variables
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Reference: Pearson Edexcel
Named variables such as light intensity, water volume, salinity, pH, humidity and handling time kept constant so that temperature is the only independent variable.
Topics that use Controlled variables
- Topic 5: On the Wild Side (Pearson Edexcel A-Level)
Related terms
- Abiotic factors
- Abundance
- Allele frequency
- Allopatric speciation
- Anthropogenic causes of climate change
- ATP as universal energy currency
- Biomass units
- Biotic factors
Using Controlled variables in the exam
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