10 free Praxis 5001 practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
Praxis 5001 Practice Test 9Tutor mode
Question 1 of 10
Science (5005)
A fourth-grade class investigated how the amount of liquid fertilizer affects the growth of radish plants. The students planted 30 radish seeds in identical pots filled with the same soil and divided the pots into five groups of 6 plants. Every plant received 50 mL of water each day and sat on the same sunny windowsill. Each group received a different amount of fertilizer once a week. After 21 days, the students measured the height of every plant and found each group's average.
Radish plant height after 21 days
Group
Fertilizer per week (mL)
Number of plants
Average height (cm)
1
0
6
8.2
2
5
6
10.6
3
10
6
12.9
4
15
6
13.1
5
20
6
9.4
Which variable is the independent variable in this investigation?