Top Tips !

• Never write "amount" you mean mass, volume or concentration. 
• Refer to "a control experiment" or "a variable that I will control (and then name the value and method of control)" but never to "a control variable"
• Independent variable is what you change.
• Dependent variable is what you actually measure in the experiment (not rate).
• Organisms vary from each other unless they are clones !
• When you suggest improvements think about improving the method rather than the equipment (e.g. control a variable that wasn't previously)

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How to improve your answers to questions about practicals in A-level Biology exam questions.

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There is plenty of excellent guidance on how to plot graphs and draw tables in the OCR practical booklet  ..... pdf

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Precision, control variables, independent variables ? Confusing for many students, however, particularly important now that this year practical skills are assessed in the exam paper. 

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