IB Biology Extended Essay Exemplar
Investigating the Effect of The Rhizophagus intraradices Fungus on Nutrient Uptake and Growth in Mentha spicata Plants under Different Phosphorus Conditions
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Criteria A: Focus and Method
5/6
0
3
6
Criteria Strands
Introduction communicates topic accurately with depth and relevance
Research question is clearly stated, focused and operational
Methodology employs an appropriate range of techniques with clear procedural detail
Inconsistency between stated number of pots (12) and actual replicates (15)
Rationale for sample size and statistical power is implied but not explicitly discussed
Minor repetitive phrasing in the introduction
Criteria B: Knowledge and Understanding
5/6
0
3
6
Criteria Strands
Use of discipline-specific terminology is accurate and consistent throughout
Relevant source material frames the study context and supports interpretation of results
Application of literature remains largely descriptive with limited critical synthesis
Some statements are referenced imprecisely, reducing source-use effectiveness
Criteria C: Critical Thinking
5/12
0
6
12
Criteria Strands
Data analysis is competently performed with clear linkage to the research question
Statistical methods (ANOVA, Tukey HSD) are correctly applied and interpreted
Arguments are logically constructed and supported by quantitative results
Evaluation of limitations and alternative explanations is somewhat superficial
Key aspects such as effect-size metrics and pH control data are not fully explored
Some minor inconsistencies (e.g., missing R², incomplete risk-assessment protocols) weaken critical depth
Criteria D: Presentation
4/4
0
2
4
Criteria Strands
Report structure is clear and consistently applied, with logical flow between sections
Layout considerations (font, headings, numbering) are correctly applied throughout
Occasional redundant headings and inconsistent spacing
Several figures and tables lack complete labels or values (e.g., missing error-bar definitions, incomplete calculation steps)