To what extent do different natural inhibitors (Citric acid, ascorbic acid and vinegar acid) at 2% concentration inhibit the enzymatic browning of apples (Malus domestica) after 30 minutes of exposure to air?SL
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6
Official IB Result
IB Grade: 6
Criteria A: Research Design
4/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations
Good
A.3Methodology description
Good
Criteria Feedback
- The student places the investigation in a specific and biologically appropriate context by explaining enzymatic browning in apples and linking it to PPO activity and the proposed inhibitors.
- The student identifies several relevant methodological factors that could affect validity, including slice size, temperature, lighting, solution freshness, and the number of slices per treatment.
- The student's procedure is broadly reproducible and includes enough detail for another student to follow the overall investigation design.
- Some key design choices are not explained clearly enough, especially the exact pH/composition of the solutions and how the ascorbic-acid tablets and vinegar were standardized.
- The ImageJ measurement procedure is not detailed enough to allow full replication, particularly the region of interest, colour handling, and how background or shadows were controlled.
- Randomization and exact standardization of slice thickness are not fully addressed, which limits confidence in the fairness and precision of the comparison.
Criteria B: Data Analysis
3/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Good
B.2Consideration of uncertainties
Poor
B.3Data processing quality
Moderate
Criteria Feedback
- The student communicates the main processed results in a clear sequence using tables, a graph, means, standard deviations, and a statistical test.
- The student uses ImageJ to obtain an objective colour measure rather than relying on subjective visual judgments.
- The student calculates and presents percentage retention, which helps make the browning trend easier to interpret.
- The raw data are not actually shown as raw values, so the reader cannot verify the spread of the original measurements or recalculate the summaries.
- Uncertainty is only partially considered, and the report does not clearly show uncertainty at each time point or explain exactly how the standard deviations were calculated.
- The ANOVA treatment is not valid for the repeated-measures structure of the data, and the reported regression statistics are not clearly correct or interpretable.
Criteria C: Conclusion
4/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and consistency
Good
C.2Scientific context comparison
Good
Criteria Feedback
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- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Criteria D: Evaluation
4/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Good
D.2Improvements
Good
Criteria Feedback
- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.