IB Internal Assessment (IA) Biology Standard level (SL) 2026 May Solution & Worked Answer
This investigation explores how varying concentrations of aloe vera gel (0%–100%) affect the rate of wound closure in Allium cepa epidermal cells over a 24-hour period.
The methodology involves mechanical wounding, microscopic imaging of stained cells, and quantitative area measurement via grid calibration. Statistical analysis includes one-way ANOVA, Tukey post-hoc tests, and effect size (η²) calculations.
Findings reveal a significant dose-dependent relationship, where increased aloe vera concentrations accelerate the rate of wound healing. This exemplar is highly valuable for its rigorous statistical treatment, detailed uncertainty propagation, and a comprehensive evaluation of experimental limitations and improvements.
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