The student had clearly stated the independent and dependent variables in the research question, identifying the type of plant and solution used, as well as the dependent variable of photosynthetic activity measured in CO₂ levels. However, the research question lacked a clear method of analysis, which could have been improved by specifying the measurement tool. Additionally, the background theory section had not adequately explained how salinity affects plant survival and photosynthesis, and there had been insufficient detail regarding the methodology for measuring CO₂ levels. The student had identified controlled variables and explained how they were controlled, as well as addressed safety and ethical issues associated with the investigation. Nonetheless, the student had failed to adequately discuss environmental issues, the choice of sampling techniques, and the methodology steps necessary for reproducibility.
