medium · Enhanced ACT Science
A gardener wanted to know whether a new mulch increases tomato yield. In Bed 1 he applied the new mulch and watered daily; in Bed 2 he used no mulch and watered every three days. At the end of the season, Bed 1 had produced more tomatoes than Bed 2.
What is the main flaw in the gardener's experimental design?
- He recorded tomato yield rather than measuring plant height
- Both the mulch and the watering frequency differed between beds
- He grew tomato plants instead of some faster-growing garden crop
- He did not track the daily air temperature within each bed
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