Biology Extended Essay Exemplar: To what extent do time intervals…

To what extent do time intervals (t=0.5h,1h,5h,10h,15h,20h,25h) allowed for leaving 7.5g of 10 samples of different legumes; kidney bean (Phaseolus vulgaris), red lentil (Lens culinaris) and soybean (Glycine max) soaked in 30.0ml of tap water, influence the amount of leached Phytic Acid (in mg/100mL) found in the filtrate, determined by measuring the discolouration of Wade reagent by Phytic Acid, and quantified by measuring absorbance (in arbitrary units, ±0.001), using a Vernier GoDirect SpectroVis Spectrophotometer set at 500nm?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

Good

A.3Methodology appropriateness and completeness

Good

Criteria Feedback

The student communicates a specific and biologically relevant investigation clearly.
The student's introduction gives the reader a strong sense of why phytic acid matters nutritionally and how soaking could affect it.
The research question is operationalized through identifiable variables and a workable experimental design.
The student selected a generally relevant method with a clear rationale for many of the design choices.

The investigation is a little too crowded because it combines several legumes with many time points.
Some important methodological details are missing or inconsistent, especially the filtration step and the wavelength used for measurement.
The research question could be more sharply focused to strengthen control of variables.
The wording and structure sometimes imply a stronger causal claim than the method can fully support.

Criteria B: Knowledge and Understanding

6/6

Criteria StrandsPro

B.1Application of source material

Good

B.2Use of terminology and concepts

Good

Criteria Feedback

The student shows strong biological grounding in the way they explain phytic acid and mineral bioavailability.
The student applies scientific terminology accurately in many places, including absorbance, calibration curve, and related assay language.
The student's discussion connects source material to the investigation rather than simply listing background facts.
The student uses terminology consistently enough that the scientific purpose of the report is usually clear.

Some key claims overstate what the method can actually measure.
The report sometimes treats phytic acid in the soaking liquid as if it were direct proof of phytic-acid loss from the seed.
A few conceptual explanations are too broad or imprecise, especially where assay results are interpreted biologically.
The distinction between measured solution concentration and seed composition needs to be much clearer.

Criteria C: Critical Thinking

9/12

Criteria StrandsPro

C.1Research analysis

Moderate

C.2Discussion and evaluation

Moderate

C.3Argument development

Moderate

Criteria Feedback

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Criteria D: Presentation

4/4

Criteria StrandsPro

D.1Structure appropriateness

Excellent

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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