The effect of active ingredients (Chlorhexidine, Cetylpyridinium Chloride, Sodium Fluoride, Eucalyptol) in alcohol-free commercial mouthwashes on the bacterial growth inhibition in Escherichia Coli using a disc diffusion assaySL
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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
Good
A.3Methodology appropriateness and completeness
Moderate
Criteria Feedback
- The student states a clear, testable research question and keeps the investigation broadly relevant to the topic of mouthwash antibacterial effects.
- The student explains the biological context well enough to show why the comparison matters and how the assay is meant to work.
- The student includes several sensible methodological features such as replicates, a control, and defined conditions.
- The investigation is not always tightly focused on the exact experiment the student actually carried out.
- The comparison is weakened because the commercial products differ in more than just the ingredient being discussed.
- Some important methodological choices, such as disc loading and formulation differences, are not controlled or incorporated into the design.
Criteria B: Knowledge and Understanding
5/6
0
3
6
Criteria StrandsPro
B.1Application of source material
Good
B.2Use of terminology and concepts
Good
Criteria Feedback
- The student uses a good range of relevant scientific terminology accurately, including membrane structure, inhibition zones, and statistical language.
- The student applies biological concepts to explain why different treatments may behave differently in the assay.
- The student supports their discussion with source material that is usually relevant to the investigation.
- Some of the explanation is descriptive rather than tightly applied to the specific question.
- A few biological claims are oversimplified, especially where diffusion and antibacterial mechanism are treated as the same thing.
- The student sometimes uses terms such as the active ingredient as if they automatically represent the whole commercial formulation.
Criteria C: Critical Thinking
10/12
0
6
12
Criteria StrandsPro
C.1Research analysis
Moderate
C.2Discussion and evaluation
Moderate
C.3Argument development
Moderate
Criteria Feedback
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Criteria D: Presentation
3/4
0
2
4
Criteria StrandsPro
D.1Structure appropriateness
Excellent
D.2Layout and formatting
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.