This article proposes and evaluates a practical methodology for teaching the middle-school cell unit
through activity-based tasks that foreground inquiry, modeling, and purposeful talk. The approach is grounded in
constructivist and sociocultural theories of learning, the 5E instructional model, and contemporary evidence on
formative assessment. A teaching sequence for 7th grade was designed around authentic problems that require
students to observe cells under a microscope, build and revise physical and diagrammatic models of organelles,
investigate osmosis with everyday materials, and justify claims with evidence in written and oral formats. The
methodology was implemented across six lessons totaling approximately 270–300 minutes in ordinary school
conditions. A pre-/post design with a concept inventory, performance rubrics for practices such as planning
investigations and interpreting data, and short reflective prompts was used to estimate learning gains and to trace
conceptual change. Results show large improvements in recognition of the cell as the basic unit of life, structure
function reasoning about organelles, and the ability to apply diffusion and osmosis ideas to new contexts.
Students’ written arguments became more mechanistic and less descriptive, while classroom discourse shifted
toward student-generated questions and evidence-based explanations. The article discusses design principles for
sequencing activity-based tasks, aligning representations across physical models, drawings, and micrographs, and
using formative assessment to surface and respond to misconceptions without interrupting inquiry.
Recommendations are offered for adapting the sequence to resource-constrained settings and for extending the
approach into genetics and physiology topics in grades 8–9.

Activity-based learning, 5E model, cell biology

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