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IB Biology SL Extended Essay Exemplar
To what extent do varying concentrations of Kalanchoe (Bryophyllum pinnatum)
extract inhibits the proliferation of K-12 Escherichia coli and Staphylococcus
aureus in LB Agar Petri dishes?
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B
Overall Score
21/28
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Criteria A: Focus and Method
6/6
0
3
6
Criteria Strands
Excellent
Topic communication and explanation
Excellent
Research question formulation and focus
Excellent
Methodology appropriateness and completeness
Criteria Feedback
Research question is sharply formulated and consistently revisited, demonstrating sustained focus.
Introduction communicates the topic accurately with comprehensive explanation of key terms and context.
Methodology is detailed and justified, providing clear evidence of thoughtful and effective selection of protocols.
Minor lapses in the background narrative (unfinished sentence) interrupt flow.
Exact filter-paper diameter is omitted and choice of LB versus Mueller–Hinton agar is not fully explained.
Criteria B: Knowledge and Understanding
5/6
0
3
6
Criteria Strands
Good
Application of source material
Excellent
Use of terminology and concepts
Criteria Feedback
Source material is generally well integrated into the discussion, with clear relevance to the investigation.
Terminology and scientific concepts are used accurately and consistently throughout the report.
Some passages rely on lengthy paraphrase and links between cited mechanisms and the student’s data remain superficial.
Statistical terminology is occasionally conflated (r vs r²) and regression outputs are misreported.
Criteria C: Critical Thinking
6/12
0
6
12
Criteria Strands
Moderate
Research analysis
Moderate
Discussion and evaluation
Poor
Argument development
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.
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Criteria D: Presentation
4/4
0
2
4
Criteria Strands
Excellent
Structure appropriateness
Good
Layout and formatting
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.
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Upgrade to PRO to see detailed feedback for all criteria in this exemplar.
Biology Extended Essay Exemplar: Kalanchoe Extract Inhibition of E Coli and S Aureus | RevisionDojo
