Which of the following best describes the purpose of a scatter plot in ecological data?

• A. To show the distribution of a single categorical variable.
• B. To illustrate relationships between two continuous variables.
• C. To compare means between different groups.
• D. To display frequency distribution.

Answer: (B)

A scatter plot is used to examine how two continuous variables relate to each other in ecological data. By plotting one variable on the x-axis and the other on the y-axis, you can see patterns: whether they tend to increase together (positive relationship), one increases as the other decreases (negative relationship), how strong the association is, and whether the relationship is linear or more complex. It also helps identify outliers and clusters that might suggest additional factors at play. This makes scatter plots ideal for questions like how temperature and metabolic rate covary or how rainfall influences plant biomass. Other plots are used for different goals—bar or pie charts show distributions of categories, box plots or bar charts with error bars compare means between groups, and histograms display the frequency distribution of a single variable.