In-class worksheet Lesson 5
Name: _____________________________ Period: ____
1. A control group is:
2. An experimental group is:
Identify the control group in the following experiment:
3. You want to see if lemon juice cleans pennies. You drop one penny into
pure lemon juice, one penny into lemon juice mixed with water, and one penny
into pure water. You want to see what makes the pennies clean.
What is your control group?
4. Breanna wants to know if it easier to break a rubber band that has
been in the freezer. She puts a rubber band in the freezer for 10 minutes,
and leaves another one on the table for 10 minutes. She measures how
hard it is to pull each of the rubber bands apart.
What is your control group?
© Hoyt, Chiara (Love and Excellence), 2020 Items
Homework Lesson 5
Name: ________________________________ Period: ____
1. A control group is:
a) a group that you don’t need in your experiment
b) the group you are leaving alone
c) exactly like your experimental group
d) the group that you are giving your independent variable
2. An experimental group is:
a) a group that you don’t need in your experiment
b) the group you are manipulating in the experiment
c) exactly like your control group
d) the group that you are not doing anything to
Identify the control group in the following experiment:
3. You do an experiment to see whether plants can grow in salt water. You
water one plant with no salt (0 grams/L), a little salt (5 grams/L), another
plant with a medium amount of salt (10 grams/L), and another plant with a
lot of salt (20 grams/L).
4. Keanna predicts that if you eat breakfast you do better in school.
Keanna does an experiment where she looks at the grades of the students
who eat breakfast and the grades of students who don’t eat breakfast.
What is her control group?
5. Alan predicts that plants will grow better with fertilizer than without
fertilizer. He designs an experiment where he gives 12 plants fertilizer and
water every day. What should Alan have for his control group?
© Hoyt, Chiara (Love and Excellence), 2020 Items