Control variables
What Control variables means in Biology A-Level, as defined for OCR.
Definitions of Control variables
Exam boards and our study guides word this term in slightly different ways. Learn the version your board uses.
Check what you remember
Read the wording for your board, then hide it and explain Control variables in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Include time in the solution, volume of solution, cube dimensions and temperature when not the variable being tested.
Factors kept constant, including temperature, carbon dioxide supply and distance from the light source.
Topics that use Control variables
- Biological membranes (OCR A-Level)
- Photosynthesis (OCR A-Level)
Related terms
- Accessory pigments
- Carbohydrate synthesis and storage
- Cell signalling and receptors
- Chloroplast ultrastructure
- Cholesterol
- Cholesterol and fatty-acid saturation
- Compartmentalisation of photosynthesis
- Compartmentalisation within cells
Using Control variables in the exam
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