ACT (Enhanced)ScienceMedium
A botanist investigates the optimal light intensity for a specific shade-loving plant. They grow identical plants under four different light intensities (500 lux, 1000 lux, 1500 lux, 2000 lux) for six weeks. All other factors such as temperature, humidity, and watering schedule are kept constant. At the end of the experiment, the average biomass (dry weight) of the plants in each group is measured. Which of the following is the most appropriate way to represent the results of this experiment to easily identify the optimal light intensity?
- AA table listing all raw biomass measurements for each individual plant.
- BA bar graph with light intensity on the x-axis and average biomass on the y-axis.
- CA pie chart showing the percentage of plants at each light intensity.
- DA scatter plot showing the average humidity over time for each group.
Show answer & explanationAnswer & explanation
Correct answer: B. A bar graph with light intensity on the x-axis and average biomass on the y-axis.
A bar graph is ideal for comparing discrete categories (different light intensities) and showing the quantitative outcome (average biomass) for each. This visual representation would clearly highlight which light intensity corresponds to the highest average biomass.
Why the other options are wrong
- A. While necessary for analysis, a raw data table is less effective for quickly visualizing trends or optimal points than a graph.
- C. A pie chart is used for showing parts of a whole, not for comparing an independent variable to a dependent variable.
- D. Humidity is a controlled variable; plotting its average over time wouldn't help identify the optimal light intensity for biomass.
Data Visualization
Presenting data graphically to make it easier to understand, analyze, and communicate patterns, trends, and outliers.
- Choosing the right graph type is crucial for effective communication.
- Graphs highlight relationships and comparisons.
- Different graph types serve different purposes (e.g., bar, line, pie, scatter).
Memory trick: Graph it right, for insight and light!