Biology Extended Essay Exemplar: To what extent does the time of… | RevisionDojo

Loading document preview...

IB Biology SL Extended Essay Example

To what extent does the time of exposure to UV-A light (0, 10, 20, 30, 40 min) affect the net polyphenol concentration (mgGAE/g) in Spinach (Spinacia oleracea) as quantitatively measured by the Folin-Ciocalteu Spectrophotometric Analysis Method?SL

Official IB Result

IB Grade: A

Criteria A: Focus and Method

6/6

Criteria StrandsPro

A.1Topic communication and explanation

Excellent

A.2Research question formulation and focus

Excellent

A.3Methodology appropriateness and completeness

Moderate

Criteria Feedback

The student states a clear, focused research question with a workable variable range and a relevant biological context.
The student explains the rationale for the investigation logically and shows why the topic matters scientifically.
The student describes a generally appropriate method with several controls and a sensible replicate structure.

The student's wording sometimes implies the assay measures polyphenols directly when it actually measures Folin–Ciocalteu-reactive reducing capacity.
Some methodological controls that affect validity, such as irradiance and temperature, are not fully addressed.
The justification for certain procedural choices could be more precise and more tightly linked to what the method can truly prove.

Criteria B: Knowledge and Understanding

4/6

Criteria StrandsPro

B.1Application of source material

Good

B.2Use of terminology and concepts

Excellent

Criteria Feedback

The student uses relevant biological and analytical terminology accurately in most places.
The student connects UV stress, plant defense pathways, and assay terminology in a scientifically informed way.
The student generally applies source material to support the background and interpretation of the investigation.

Some phrases are conceptually imprecise, especially when the assay result is described as direct polyphenol concentration.
The explanation of how raw readings become final concentrations is not always fully transparent.
Some supporting sources are not closely matched to the exact wavelength, tissue state, or assay conditions of the student's study.

Criteria C: Critical Thinking

12/12

Criteria StrandsPro

C.1Research analysis

Moderate

C.2Discussion and evaluation

Moderate

C.3Argument development

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.

Criteria D: Presentation

3/4

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.

Loading scores...

Official IB Result

IB Grade: A

Criteria A: Focus and Method

6/6

Criteria StrandsPro

A.1Topic communication and explanation

Excellent

A.2Research question formulation and focus

Excellent

A.3Methodology appropriateness and completeness

Moderate

Criteria Feedback

The student states a clear, focused research question with a workable variable range and a relevant biological context.
The student explains the rationale for the investigation logically and shows why the topic matters scientifically.
The student describes a generally appropriate method with several controls and a sensible replicate structure.

The student's wording sometimes implies the assay measures polyphenols directly when it actually measures Folin–Ciocalteu-reactive reducing capacity.
Some methodological controls that affect validity, such as irradiance and temperature, are not fully addressed.
The justification for certain procedural choices could be more precise and more tightly linked to what the method can truly prove.

Criteria B: Knowledge and Understanding

4/6

Criteria StrandsPro

B.1Application of source material

Good

B.2Use of terminology and concepts

Excellent

Criteria Feedback

The student uses relevant biological and analytical terminology accurately in most places.
The student connects UV stress, plant defense pathways, and assay terminology in a scientifically informed way.
The student generally applies source material to support the background and interpretation of the investigation.

Some phrases are conceptually imprecise, especially when the assay result is described as direct polyphenol concentration.
The explanation of how raw readings become final concentrations is not always fully transparent.
Some supporting sources are not closely matched to the exact wavelength, tissue state, or assay conditions of the student's study.

Criteria C: Critical Thinking

12/12

Criteria StrandsPro

C.1Research analysis

Moderate

C.2Discussion and evaluation

Moderate

C.3Argument development

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.

Criteria D: Presentation

3/4

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.