To what extent does the incubation temperature (20°C, 30°C, 40°C, 50°C, and 60°C) affect the soluble protein concentration of lentil (Lens culinaris) extracts as determined by the Biuret test and measured using colourimetry?SL
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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 and clearly situated in a specific biological context.
- The student justifies the temperature range and includes several thoughtful controls and replicates.
- The student's procedure contains enough operational detail that another reader could broadly follow the investigation.
- The student shows clear awareness of how methodological choices affect fairness and reliability.
- Some important aspects of the method are not fully explained, especially how temperature was verified in practice.
- The investigation does not fully resolve whether heating changes extraction efficiency or the solubility of already prepared extract.
- There are a few inconsistencies and omissions, such as the blank choice and the mismatch in water volumes.
- The context is weakened by a couple of scientific inaccuracies and an overreliance on evidence from a less directly comparable protein source.
Criteria B: Data Analysis
4/6
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 organised clearly, with repeated trials shown for each temperature.
- The student calculates means, standard deviations, and displays a graph with labelled axes, error bars, and a trendline.
- The student makes an appropriate comment about the weakness of the linear relationship instead of overstating the pattern.
- The student's qualitative observations add useful experimental context to the numerical results.
- There is an internal inconsistency in the processed values, especially for the 20°C mean, which needs to be corrected and kept consistent throughout.
- A single averaged uncertainty for all error bars reduces precision and hides variation between temperatures.
- The concentration conversion is not valid as written because the chosen basis does not match the assay and sample type.
- The outlier removal is not sufficiently justified statistically.
Criteria C: Conclusion
6/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and consistency
Good
C.2Scientific context comparison
Moderate
Criteria Feedback
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- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Criteria D: Evaluation
4/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Good
D.2Improvements
Excellent
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.