The student clearly stated the independent variable as the duration of boiling broccoli and the dependent variable as the concentration of chlorophyll. The research question was well-defined, and the student described the analysis method using a spectrophotometer. A detailed background theory relevant to chlorophyll and its degradation was provided, which supported the investigation. The student explained the choice of sampling techniques, controlled variables, and addressed safety, ethical, and environmental issues associated with the investigation. Furthermore, the methodology was sufficiently detailed and free of irrelevant information, allowing for reproducibility of the experiment.
