Variables and controls
The independent, dependent, and controlled variables should be explicit, justified, and connected to the biological mechanism.
Science IA
IB Biology IA review for variables, data, and evaluation.
A Biology IA needs more than a completed experiment. It needs a clear biological rationale, controlled method, processed data, graph interpretation, and evaluation that explains how limitations affect the conclusion.
Biology IA areas to review
Processing and uncertainty
Processed data should be easy to trace back to raw data, with units, uncertainty, sample size, and appropriate summaries.
Limitations with impact
Strong evaluation explains how each limitation affects validity, reliability, precision, or the strength of the conclusion.
Biology IA review FAQ
What is the most common Biology IA weakness?
Many Biology IA drafts report results clearly but do not explain what the data shows about the research question or why limitations affect confidence.
Should a Biology IA review check graphs?
Yes. Graph choice, labels, uncertainty, trend explanation, and the paragraph after the graph all matter for communication and analysis.
Can Coursework Grade Studio review HL and SL Biology IAs?
Yes. Students can choose course and level context before reviewing the draft.
Related guides
Want Biology IA-specific feedback?
Review my Biology IAUpload the draft and review the investigation through subject, course, and level context.