How does modifying the concentrations (0%, 20%, 40%, 60%, 80%, 100%) of Melaleuca alternifolia leaf oil (Tea Tree oil) affect the growth of Escherichia coli (E. coli) by measuring the zone of inhibition of E.coli?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
Moderate
A.3Methodology description
Moderate
Criteria Feedback
- The student's research question is specific, focused, and clearly testable.
- The student places the investigation in a scientifically relevant context by linking tea tree oil chemistry to bacterial structure.
- The student's method contains enough operational detail to make the investigation largely reproducible.
- The question should name the prepared tea tree oil–Polysorbate 80 stock solution more precisely.
- Some important controls and methodological justifications are missing or only partly explained.
- A few procedural details remain ambiguous, especially around plate layout, measurement conventions, and inoculum standardization.
Criteria B: Data Analysis
5/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Moderate
B.2Consideration of uncertainties
Poor
B.3Data processing quality
Moderate
Criteria Feedback
- The student's data are organised clearly in tables and a graph, making the main trend easy to follow.
- The student processes repeated measurements into means, which is an appropriate way to summarise the results.
- The student includes error bars and shows awareness that variation exists between trials.
- The student's use of units is inconsistent in places, which reduces precision.
- The statistical treatment is not fully correct or transparently shown.
- Uncertainty is acknowledged only in a limited way and is not fully incorporated into the processing.
Criteria C: Conclusion
6/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and consistency
Moderate
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
3/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Moderate
D.2Improvements
Moderate
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.