The student clearly states the independent variable as the concentration of potassium chloride (KCl) solution and the dependent variable as the growth of Solanum lycopersicum, measured by stem length increase. However, the student does not adequately describe the method of analysis in the research question, as it lacks specifics on how the measurements will be taken. While the student provides a thorough background theory and effectively identifies controlled variables, they have not explained the choice of techniques for measuring the variables, nor have they justified the number of trials conducted. The student does address safety and ethical considerations well, but the environmental impact of the investigation requires further elaboration. Overall, the methodology is well described and allows for reproducibility, though some areas need improvement for clarity and justification.
