Preparing for Practical Assessment (OCR A-Level Biology A): Flashcards
📚Flashcards
Practise the cards
10 cards from this deck
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Practise the cards
10 cards from this deck
Independent variable
Independent variable
Single variable deliberately changed to test effect on results
Dependent variable
Dependent variable
What you measure to determine the experimental outcome
Controlled variables
Controlled variables
All other variables kept constant or monitored
Purpose of control experiment
Purpose of control experiment
Shows independent variable, not other factors, caused changes
Qualitative experiments
Qualitative experiments
Collecting observations without numerical data
Quantitative experiments
Quantitative experiments
Collecting and recording numerical measurements
Standard length unit in biology
Standard length unit in biology
Millimetres (mm), not centimetres
Anomalies in results
Anomalies in results
Results >10% from mean, inconsistent with trends
Rf value formula
Rf value formula
Distance moved by solute / distance moved by solvent
Rf value characteristics
Rf value characteristics
Always less than 1 and has no units