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# Controls and Variables PowerPoint PPT Presentation

Controls and Variables. Practice Test #2. Question #1: In a contolled experiment, the only difference between the control group and experimental group is. the control group is always given something the experimental group is always given some type of treatment

Controls and Variables

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## Controls and Variables

Practice Test #2

Question #1:

In a contolled experiment, the only difference between the control group and experimental group is.....

the control group is always given something

the experimental group is always given some type of treatment

the experimental group will always change

the control group will always change

Question #2

Janet is doing an experiment to see if the number of peanuts produced per plant changes when the amount of fertilizer given to the plants is changed. What is the DEPENDENT VARIABLE?

a. amount of fertilizer

b. number of peanuts per plant

c. type of fertilizer

d. peanuts

Question #3

Mary wants to find out whether plants produce more leaves when grown in red, blue, or green light. What is the DEPENDENT VARIABLE?

a. color of light

b. type of leaves

c. average number of leaves

d. none are correct

Question #4

A scientist plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of water and light intensity. She checks the growth of the corn over the course of 5 months. What is a constant (same every time) in this experiment?

a. Plant height

b. Corn without fertilizer

c. Corn with fertilizer

d. Amount of water & sunlight