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ITBS Level 9 Grade 3 Science 4
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Avg score: 55% Most missed: “What could the student do differently to be more certain that this chemical actu…”

Use the information below and your knowledge of science to answer questions below:

A student decides to try putting different chemicals on plants to see if any of them help the plant grow. He treats various specimens of the same type of plant with different chemicals and obtains the following data:

CHEMICAL:

HEIGHT

(in inches):

None

30

Chemical #1

26

Chemical #2

25

Chemical #3

36

Chemical #4

12

ITBS Level 9 Grade 3 Science 4
Time left 00:00
4 Questions

1. In order to properly compare the plant’s growth, the student also measured one plant to which he did not add any extra chemicals. Which of the following terms describes this plant?
2. Which of the following statements is best supported by the student’s data?
3. What could the student do differently to be more certain that this chemical actually helped the plant’s growth?
4. According to the student’s data, which chemical helped the plant to grow the best?