Correct IB Biology IA referencing requires two things: an in-text citation wherever you use another person’s words, ideas, data, method, image, or other work, and a complete entry for that source in your reference list. Referencing only at the end is not sufficient because the reader must be able to identify exactly which material came from each source.
Academic integrity also extends beyond citations. Your scientific investigation must report data honestly, acknowledge permitted collaboration, and remain your own individual work. This guide explains what to reference, how to paraphrase, how to handle data and group work ethically, and how to check your IA before submission.
What the IB requires for Biology IA referencing
The current Biology IA is officially called the scientific investigation. It is an open-ended investigation in which you gather and analyse data to answer your own research question, producing an individual report of no more than 3,000 words. It contributes 20% of the final Biology grade at both SL and HL, according to the official IB Biology subject brief.
The IB defines plagiarism as presenting another person’s ideas, words, or work, intentionally or unintentionally, without proper, clear, and explicit acknowledgment. Its academic integrity policy requires students to acknowledge material that has been copied, adapted, paraphrased, or translated.
In practical terms, your report should:
- identify borrowed material at the point where it appears;
- include full bibliographic details for every cited source;
- use a consistent citation system;
- distinguish your findings and analysis from published information;
- contain only authentic work that you can explain and defend.
The IB does not prescribe one universal referencing style. Your school or teacher may require APA, MLA, Chicago, Harvard, or another recognized system. Follow that instruction consistently rather than switching formats between sources.
The RevisionDojo Biology IA essentials guide provides a useful overview of the current investigation format, including report length, collaboration, and referencing expectations.
What must be cited in a Biology IA
A citation is needed whenever material is not your original work or is not reasonable common knowledge for the intended reader. Biology students often remember to cite quotations but overlook methods, diagrams, numerical values, and scientific explanations.
| Material used | Citation needed? | Appropriate treatment |
|---|---|---|
| Exact words from an article | Yes | Use quotation marks and an in-text citation |
| A scientific explanation paraphrased in your words | Yes | Rewrite genuinely and cite the source |
| A method copied or adapted from a protocol | Yes | State that it was adapted and cite the protocol |
| Published or database data | Yes | Cite the dataset and explain any processing |
| A literature value, such as an optimum pH | Yes | Cite the source beside the comparison |
| An external diagram, photograph, or graph | Yes | Credit it in the caption and reference list |
| A figure you adapted from another source | Yes | Label it “adapted from” and cite the original |
| Your own raw measurements | No external citation | Label them clearly as data collected in this investigation |
| Your own graph made from your measurements | No external citation | State that it was produced from your experimental data |
| Widely accepted basic knowledge | Usually no | Cite if the claim is specialized, disputed, or numerically precise |
For example, suppose your investigation tests how pH affects catalase activity. The claim that enzymes have active sites may be treated as basic course knowledge, but a specific claim that catalase from a named organism has a particular optimum pH should be supported with a reliable source.
If you adapt a published method, write something precise such as: “The catalase assay was adapted from Smith and Lee (2024), with hydrogen peroxide concentration changed from 3% to 1.5%.” This acknowledges the source while making your own methodological decisions visible.
In-text citations and the reference list
An in-text citation appears where the borrowed information is used. A reference list gives the full details needed to locate each cited source. Every in-text citation should match an entry in the reference list, and every reference-list entry should normally correspond to material actually cited in the report.
Using APA-style examples, the basic patterns are:
- Paraphrase: Catalase activity is influenced by temperature and pH (Author, 2024).
- Author named in the sentence: Author (2024) reported that catalase activity declined above the optimum temperature.
- Direct quotation: “Exact borrowed wording” (Author, 2024, p. 18).
- Organization as author: The assay should be calibrated before measurements are taken (Organization, 2025).
A journal reference would normally include the authors, year, article title, journal, volume, issue, page range, and DOI. A website reference should identify the author or organization, date where available, page title, site, and URL. Database references should include the database or dataset name and enough information for another person to retrieve the same data.
Use direct quotations sparingly in a scientific report. Your IA is intended to demonstrate your scientific reasoning, so concise paraphrasing is usually more effective. RevisionDojo’s IA citation best practices can help you audit citation consistency.
How to paraphrase without plagiarizing
Paraphrasing means reconstructing an idea in your own language and sentence structure while preserving its meaning. Replacing several words with synonyms is not a genuine paraphrase, and adding a citation does not make near-copying good academic writing.
Use this process:
- Read the source until you understand the relevant idea.
- Close or hide it before writing.
- Explain the idea from memory in language suited to your investigation.
- Compare your version with the original for accuracy and excessive similarity.
- Add the citation immediately.
For instance, if a source states that increasing temperature raises molecular kinetic energy and collision frequency until enzyme structure becomes disrupted, do not retain that entire sentence pattern. Explain the mechanism in relation to your variables, then cite the source. This demonstrates understanding rather than word substitution.
Maintain a research log containing publication details, useful page numbers, copied quotations clearly marked as quotations, and notes written in your own words. This prevents accidental plagiarism when notes are transferred into the report. The RevisionDojo guide to ethical IA research explains how source tracking supports a defensible research process.
Using data ethically
Scientific integrity requires you to present observations as they occurred, including inconvenient values. Fabrication means inventing data, while falsification includes altering, deleting, or selectively reporting results in a misleading way. Both misrepresent the investigation and can constitute academic misconduct.
You may identify a possible anomalous result, but you should not silently remove it. Show the value, apply a defensible statistical or methodological reason for excluding it, and explain how exclusion affects the outcome. Repeating a trial is acceptable when justified, but replacing an unwanted result with a more convenient number is not.
For secondary-data investigations, record:
- the original database or publication;
- filters, search terms, species, dates, and units used;
- any cleaning, conversion, or exclusion decisions;
- calculations used to transform the data;
- limitations affecting reliability or comparability.
Do not present database values as measurements you collected yourself. Equally, do not copy another student’s raw data, graph, or calculations. RevisionDojo’s discussion of ethical Biology data collection offers further examples of transparent reporting.
Collaboration, collusion, and individual work
The current Biology course permits limited collaboration during data collection. The IB’s Biology curriculum update explains that students may work in small groups and use similar methodologies where appropriate, provided their variables differ as required and each student’s collected data is unique.
Permitted collaboration is not permission to produce a shared report. Your research question, data used for assessment, processing, graphs, written method, analysis, conclusion, and evaluation must satisfy the subject rules and remain your own work.
| Usually legitimate collaboration | Likely collusion or misconduct |
|---|---|
| Sharing equipment or collecting a larger dataset under teacher-approved conditions | Submitting the same raw dataset as another student |
| Discussing general biological theory | Writing or rewriting another student’s explanation |
| Helping set up common apparatus | Sharing report paragraphs, calculations, or graph files |
| Comparing general experimental problems | Agreeing on identical conclusions and evaluations |
| Giving broad peer comments | Editing a peer’s report so extensively that the writing is no longer theirs |
Collusion occurs when unauthorized cooperation allows work produced jointly or by another person to be submitted as individual work. It can affect both the student receiving assistance and the student providing it. RevisionDojo’s guide to plagiarism and collusion clarifies this distinction.
Using AI and outside assistance responsibly
The IB does not treat AI-generated material as a student’s original work. Its official statement on AI in assessment states that included AI-generated text, images, or graphs must be credited in the body of the work and appropriately referenced in the bibliography.
Follow your school’s policy, which may impose tighter restrictions. Never use AI to invent references, generate data, conceal copied writing, or produce analysis that you submit as your own. If an allowed tool contributes material that enters the report, retain the prompt, output, tool name, and generation date so that you can provide the disclosure required by your school and current IB guidance.
Jojo AI can be used as a learning and feedback tool, but suggestions should be checked against your sources and teacher guidance. The RevisionDojo Biology IA Grader can identify areas to review, while you remain responsible for every claim, calculation, citation, and final sentence.
Common referencing mistakes
Avoid these recurring problems:
- listing a source in the bibliography without citing it in the report;
- citing the end of a long paragraph when it is unclear which sentences came from the source;
- paraphrasing too closely to the original wording;
- citing a search engine instead of the article or dataset it located;
- using an image URL without naming its creator or original publication;
- citing a secondary website for a claim when the original study is available;
- failing to acknowledge an adapted method;
- copying a reference generated by software without checking it;
- treating a low similarity score as proof that the work is academically honest.
A similarity checker identifies matching text, not the full context of authorship or scientific integrity. It cannot determine whether data were invented, collaboration became collusion, or a paraphrase accurately represents its source.
Final submission checklist
Before authenticating your report, check that:
- every quotation, paraphrase, method, image, dataset, and literature value is cited;
- all in-text citations match complete reference-list entries;
- one citation style is used consistently;
- source notes and raw data are retained;
- exclusions and transformations are transparent;
- figures distinguish your work from adapted or reproduced material;
- collaborative data collection is acknowledged accurately;
- your report was written and analysed independently;
- any permitted AI-generated material is disclosed correctly;
- you can explain the origin and purpose of every part of the report.
Conclusion
Strong IB Biology IA referencing makes the boundary between published knowledge and your contribution unmistakable. Cite borrowed material where it appears, provide complete references, paraphrase from understanding, report data truthfully, and keep collaboration within the limits established by your teacher and the subject guide.
RevisionDojo’s Biology IA guides, exemplars, and coursework feedback can help you review structure without copying another student’s substance. Once the IA is complete, strengthen your exam technique by attempting a paper independently and then using the IB Biology past paper video solutions to analyse mistakes.
Sources and referenced URLs
- IB Academic Integrity Policy
- IB Biology subject brief, first assessment 2025
- IB Biology curriculum updates
- IB statement on artificial intelligence in assessment
- RevisionDojo Biology IA essentials
- RevisionDojo IA citation best practices
- RevisionDojo ethical IA research and referencing
- RevisionDojo integrity in Biology research
- RevisionDojo plagiarism and collusion guide
- RevisionDojo Biology IA Grader
- RevisionDojo IB Biology past paper video solutions