IB Internal Assessment (IA) Biology Higher level (HL) 2026 May Solution & Worked Answer

Investigating the Effect of Temperature on the Rate of Catalase Enzyme Activity in Solanum tuberosum

Solution Overview

This investigation explores how varying temperatures ($15^{\circ}C$ to $75^{\circ}C$) affect the rate of potato catalase activity during the decomposition of 3% hydrogen peroxide, measured by oxygen gas volume.

The methodology involves enzyme extraction from potato, controlled water baths, and gas pressure sensor data collection. A one-way ANOVA was employed to validate the statistical significance of the results.

Findings identified an optimal temperature of $45^{\circ}C$, followed by a decline due to enzyme denaturation. This exemplar is particularly valuable for its critical evaluation of methodological failures, specifically the impact of heating the substrate versus the enzyme, and its thorough analysis of uncontrolled variables.

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