This pack covers two distinct skill areas that are regularly assessed together: the biology of cell differentiation and the data-handling skill of reading percentile charts.

The Topic Mastery Sheet provides a full comparison table of specialised animal cells with their structural features and functions, and a worked calculation section using values from the official Edexcel mark scheme - including the 130% mass increase and the chart readings at specific percentiles. The error box addresses the most common partial-credit error on the growth data question.

The Student Exam Practice Sheet (20 marks) includes: definition of growth, two-way cell specialisation question, MCQ on differentiation, a five-part percentile chart data question using official mark scheme values (8 kg, 9%, 130%), and root hair cell adaptation.

The Teacher Answer Key specifies the exact wording required for the percentile band answer, with examiner notes on why students lose marks by citing a single percentile line.

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