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ACT
ACT Science Section

Impact of Soil Type on Flowering Plant Growth

Very Hard Research Summaries Interpreting Results

Researchers conducted a controlled study to evaluate the relationship between different soil types and the growth rates of a particular flowering plant species, Rudbeckia hirta. The study utilized three soil types: sandy soil, loamy soil, and clay soil. Each soil type was tested in three replicates, with identical conditions of sunlight and watering. After a growth period of eight weeks, the researchers recorded the height of the plants as a measure of growth rate.

Below are the average height measurements (in centimeters) at the end of the study:

  • **Sandy Soil**: 15.2, 16.0, 14.8
  • **Loamy Soil**: 22.1, 23.0, 21.5
  • **Clay Soil**: 19.0, 18.5, 19.5

Based on the results, what conclusion can be drawn regarding the impact of soil type on the growth rate of Rudbeckia hirta?

Hint

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