What is the effect of ascorbic acid concentration (0.00–0.20 M) on enzymatic browning in Malus domestica apple cubes, measured as absorbance at 420 nm after 24 hours?HL
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7
Official IB Result
IB Grade: 7
Criteria A: Research Design
6/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations
Good
A.3Methodology description
Moderate
Criteria Feedback
- The student's research question is focused, quantitative, and operationalised with a clear independent variable, dependent measure, biological material, and time frame.
- The student situates the investigation in a specific biological context and shows strong understanding of the browning mechanism they are investigating.
- The student's method has a clear overall sequence and enough structure that the investigation can largely be followed.
- Some important design controls are not fully specified, especially treatment volume, sample mass or thickness, and how exposure was standardised.
- The student does not verify final pH after adding ascorbic acid, which leaves a major confounding variable unresolved.
- A few procedural details would still be needed for full reproducibility, including the exact dilution volumes and the measurement setup.
Criteria B: Data Analysis
6/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Moderate
B.2Consideration of uncertainties
Moderate
B.3Data processing quality
Moderate
Criteria Feedback
- The student's raw data are clearly organised with replication for each concentration and enough information to see the overall trend.
- The student processes the data appropriately with means, standard deviations, and statistical testing, which shows a good attempt to move beyond simple observation.
- The student includes uncertainty and variability in the analysis, showing awareness that the results are not exact.
- The presentation of the processed data is not fully consistent, especially where the graph does not appear to match the reported spread of the results.
- Some processing steps are not shown clearly enough for the reader to audit how the summary values were obtained.
- The analysis sometimes overreaches by implying more about mechanism than the data themselves can demonstrate.
Criteria C: Conclusion
5/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and consistency
Good
C.2Scientific context comparison
Moderate
Criteria Feedback
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- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Criteria D: Evaluation
6/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Good
D.2Improvements
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.