Overall Score: 9/24
IB Grade: 4
Was this exemplar helpful?
General feedback
9/24
0
12
24
5.1·weakness
Page 5
The safety section ends abruptly and lacks complete procedures (e.g., handwashing, use of gloves); expand to fully outline precautions.
5.2·strength
Page 5
Safety considerations correctly note potential eye irritation from citric acid, showing awareness of minor risks.
Criteria A: Research Design
4/6
0
3
6
Criteria Strands
Excellent
Research question context
Moderate
Methodological considerations
Good
Methodology description
Criteria Feedback
- The research question is described within a specific, relevant biological context (acid rain pH effects on radish germination).
- The apparatus list is comprehensive, detailing all required materials for reproducibility.
- The method is detailed with numbered steps and quantitative details, allowing replication with minimal ambiguity.
- Background relies heavily on a single source and lacks integration of radish-specific pH response mechanisms.
- There is no protocol for verifying or re-measuring pH at watering intervals, reducing methodological rigor.
- Controlled variables (e.g., soil depth) are defined by eye rather than standardized measures, introducing potential variability.
Criteria B: Data Analysis
1/6
0
3
6
Criteria Strands
Moderate
Communication of data recording and processing
Poor
Consideration of uncertainties
Poor
Data processing quality
Criteria Feedback
- Data presentation is well signposted with clear tables and a labelled bar graph.
- Use of mean formula shows foundational understanding of data analysis procedures.
- The mean and standard deviation calculations contain major inaccuracies and are implausible given the raw data.
- Uncertainties are only implied (“±1 mm”) with no propagation or quantitative treatment.
- Key statistical tests are omitted and the standard deviation formula is mistyped, undermining data-processing validity.
Criteria C: Conclusion
2/6
0
3
6
Criteria Strands
Moderate
Conclusion relevance and consistency
Poor
Scientific context comparison
Criteria Feedback
- The conclusion directly addresses the research question and summarizes the observed trend.
- There is a qualitative link between the conclusion and the presented results.
- The conclusion does not fully align with the flawed data analysis and fails to address those errors.
- Comparison to accepted scientific context is superficial, with only a single generic reference.
- No quantitative comparison to literature values or detailed mechanism discussion is provided.
Criteria D: Evaluation
2/6
0
3
6
Criteria Strands
Moderate
Methodological weaknesses
Moderate
Improvements
Criteria Feedback
- Specific methodological weaknesses (uneven soil mass, limited sample size, sub-optimal light conditions) are identified.
- Realistic improvement suggestions (weighing soil, increasing sample size, adding alkaline treatment) are directly linked to the stated weaknesses.
- The relative impact of each methodological weakness on result reliability is not explained.
- Suggested improvements lack quantitative targets (e.g., sample size, light intensity) to operationalize them.
- No power analysis or detailed explanation of how changes would enhance validity is provided.