How does increasing the concentration of sodium chloride (NaCl) solutions from 0.0% to 4.0% affect the mass change of Solanum tuberosum tissue after a 24-hour immersion period?SL
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7
Official IB Result
IB Grade: 7
Criteria A: Research Design
5/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations
Good
A.3Methodology description
Good
Criteria Feedback
- The student's research question is focused, quantitative, and clearly grounded in a relevant biological context.
- The student justifies the choice of potato tissue and NaCl concentrations in a way that shows good experimental awareness.
- The student's method is mostly reproducible because it includes key details such as replicates, immersion time, tissue dimensions, and solution preparation.
- Some parts of the rationale are more descriptive than explanatory when it comes to whether the design is sufficiently robust.
- The concentration spacing is fairly wide for pinpointing an isotonic point precisely.
- A few procedural details remain ambiguous, especially around repeated solution preparation and handling of repeated measurements.
Criteria B: Data Analysis
5/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Good
B.2Consideration of uncertainties
Moderate
B.3Data processing quality
Good
Criteria Feedback
- The student's data are presented in a structured way with raw values, calculated changes, summary statistics, and graphing.
- The student uses appropriate processing steps such as means, standard deviations, percentage change, and inferential statistics.
- The student's worked example and statistical reporting make the analysis easier to follow and verify.
- The student's sign convention and some table values are internally inconsistent, which weakens clarity and confidence in the processing.
- The treatment of uncertainty is present, but it is not fully propagated through the mass-change calculations.
- The graph and regression interpretation could be more careful, especially when estimating the isotonic point from broad concentration intervals.
Criteria C: Conclusion
5/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and consistency
Excellent
C.2Scientific context comparison
Good
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
5/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Excellent
D.2Improvements
Excellent
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.