What is the effect of different chilli varieties on the growth inhibition of Escherichia coli and Micrococcus luteus determined by measuring the diameter of the zone of no growth (in mm) using the disk diffusion method?SL
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A
Official IB Result
IB Grade: A
Criteria A: Focus and Method
5/6
0
3
6
Criteria StrandsPro
A.1Topic communication and explanation
Good
A.2Research question formulation and focus
Excellent
A.3Methodology appropriateness and completeness
Moderate
Criteria Feedback
- The student stated a clear research question and kept the investigation anchored to a relevant biological comparison.
- The student explained the basic microbiological method and the rationale for comparing two bacterial groups.
- The student showed an attempt to connect the topic to the properties of chilli compounds and bacterial cell envelopes.
- Some background information, such as the TRPV1 discussion, drifted away from the investigation’s main focus.
- The method does not fully standardise the independent variable, so comparisons between varieties are not as secure as they could be.
- The procedure needs more detail about replication, plate allocation, and how measurements were taken.
Criteria B: Knowledge and Understanding
3/6
0
3
6
Criteria StrandsPro
B.1Application of source material
Moderate
B.2Use of terminology and concepts
Good
Criteria Feedback
- The student uses appropriate biological terminology in many places, including key ideas about bacterial structure and antibacterial action.
- The student applies source material in a relevant way when linking capsaicin-related ideas to the hypothesis.
- The student generally presents scientific units, names, and concepts in a recognisable academic style.
- Some terminology is used imprecisely, such as the TRPV1 discussion and occasional overstatement of SHU as if it were a direct measurement of the sample tested.
- A number of claims go beyond what the cited sources can securely prove.
- Several references are not traceable in the bibliography, which weakens the reliability of the source base.
Criteria C: Critical Thinking
12/12
0
6
12
Criteria StrandsPro
C.1Research analysis
Moderate
C.2Discussion and evaluation
Poor
C.3Argument development
Good
Criteria Feedback
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Criteria D: Presentation
4/4
0
2
4
Criteria StrandsPro
D.1Structure appropriateness
Excellent
D.2Layout and formatting
Good
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.