Read Germination from Seed Conditions
Match a graph’s axes to the exact causal question being tested.
Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Plot the measured seed variable
The treatment history changes mineral Z availability to parent plants, but the experiment measures mineral Z retained inside their seeds and then germinates those seeds on mineral-free medium. To test whether seed reserve predicts germination, plot seed mineral concentration on the x-axis and percentage germination on the y-axis. A graph using only the parent solution concentration misses the variable being tested. Choose B.
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- ✓Use the measured variable in the seed, not merely the earlier treatment concentration.
- ✓Use percentage germination as the outcome variable.
Treatment, measured predictor and outcome can be different variables. Read the method before choosing graph axes.
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