AQA AS Biology Practice Exam 2025 – The Complete All-in-One Guide for Exam Success!

Using a colorimeter enhances the repeatability of results primarily because it eliminates subjective color interpretation. When researchers measure color changes in solutions, human perception of color can vary significantly from person to person. This subjectivity can lead to inconsistencies in data collection, making it difficult to repeat experiments and obtain reliable results.

A colorimeter quantifies color intensity by using specific wavelengths of light, providing precise and objective measurements. This objective assessment means that different researchers or even the same researcher measuring on different occasions are more likely to obtain the same results, thereby improving the reliability and repeatability of the data collected in experiments.

In contrast, qualitative outcomes and differing sample requirements do not inherently enhance repeatability, and increasing measurement time could hinder the overall efficiency of an experiment rather than supporting the consistency of results.