Biology Extended Essay Exemplar: To what extent do undiluted…

To what extent do undiluted essential oils from Eucalyptus globulus, ,Azadirachta indica (neem ), Melaleuca alternifolia (tea leaves) ,Aloe barbadensis (Aloe Vera ) and Cocos nucifera (Coconut ), differ in their antifungal efficacy against Rhizopus stolonifer (bread mold) ,as measured by the diameter of the zone of inhibition (mm) on potato dextrose agar after saturating 6 mm sterile filter paper discs with each oil placing them on spore-inoculated plates and incubating at 25.0 °C ± 0.5°C for 48 hours ?SL

Official IB Result

IB Grade: A

Criteria A: Focus and Method

5/6

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 states a clear biological investigation with a focused comparison of five treatments against one fungus.
The student communicates the practical context and overall purpose of the study effectively.
The student's research question is specific, measurable, and appropriately tied to the experimental setup.

Some background explanation is not fully precise or internally consistent, especially around the naming of the substances and culture medium.
The question includes methodological detail that would be better placed in the procedure.
A few terms are used loosely, which weakens scientific clarity.

Criteria B: Knowledge and Understanding

4/6

Criteria StrandsPro

B.1Application of source material

Moderate

B.2Use of terminology and concepts

Moderate

Criteria Feedback

The student applies source material in a mostly relevant way to explain possible antifungal mechanisms.
The student uses scientific terminology appropriately in many places, including terms related to inhibition zones, variables, and fungal growth.
The student shows a solid understanding of the biological ideas behind the investigation.

Some sources are only indirectly relevant to the organism or assay the student studied.
Terminology is not always used consistently, especially when describing the substances being tested.
A few claims are broader than the evidence in the sources actually supports.

Criteria C: Critical Thinking

10/12

Criteria StrandsPro

C.1Research analysis

Moderate

C.2Discussion and evaluation

Moderate

C.3Argument development

Moderate

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.

Criteria D: Presentation

4/4

Criteria StrandsPro

D.1Structure appropriateness

Good

D.2Layout and formatting

Good

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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IB Biology SL Extended Essay Example

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