8/27 Step 1 Experimental Design Warm Up AP

Last updated 7 months ago

1 question

Scientists are interested in investigating the possibility that plants can be used to remove heavy metals from contaminated soil. They divide a sample of soil with heavy metal contamination into five different pots and plant five different species of grass they believe will take up metals into their roots and leaves. They also plant the same grasses in five pots with uncontaminated soil. After allowing the grasses to grow for a month, they cut the grass and measure the concentration of metals in milligrams per kilogram.

Match the step of experimental design with its step from the experiment.

Draggable item		Corresponding Item
Dependent variable		The pots growing grasses in uncontaminated soil
Data		Species of grasses
Control		Concentration of metals in milligrams per kilogram
Hypothesis		Species A will absorb the most heavy metals
Independent variable		Species A - 5 mg/kg Species B - 3 mg/kg Species C - 1 mg/kg Species D - 10 mg/kg Species E - 4 mg/kg