Control Groups - SC.5.N.1.4

Eiko is doing an experiment to determine the best fertilization plan for bean plants.

She will test four groups of four plants using this schedule.

Which group is the control group?

• Group A

• Group B

• Group C

• Group D

Tags

NGSS.MS-LS2-4

A drug company is testing a new medicine. They give one group of test subjects the new medicine in a tablet. They give the other group an identical tablet with no medicine.

What is the best reason that one group gets a matching tablet with no medicine?

• to find out how long it takes people to get well with no medicine

• to find out whether people really get well or if they are just pretending

• to be sure it is the medicine that makes people well and not anything else

• to find out whether the new medicine makes people more sick than people who get no medicine

Tags

NGSS.MS-ETS1-3

Martin is doing an experiment to see the way plants grow without soil. He is growing the plants in different solutions of water and nutrients. In this experiment, what is a plant

that gets no nutrients called?

• condition

• control

• mixture

• variable

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Ikaia is experimenting with vinegar, salt, and lemon to see which keeps food from spoiling for the longest time. He uses unsalted beef broth as the “food”. He measures

one-half cup of broth into each of four cups. He adds 10 mL of salt to one cup, 15 mL of lemon juice to another cup, 15 mL of vinegar to one cup, and nothing to the last cup.

Which cup of broth would you expect to spoil most quickly?

• cup with vinegar because it smells worst

• cup with nothing, because it is the control

• cup with lemon juice because it is most sour

• cup with salt because only 10 ml of salt was used

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A gardener is doing an experiment. He is trying to find the solution of nutrients and water that is best for growing carrots.

He plants four groups of carrots. Which group shows that no nutrients were provided?

• Group A

• Group B

• Group C

• Group D

Tags

NGSS.MS-LS2-1

NGSS.MS-LS1-5

Asmee is doing an t investigation using four of her brother’s baby teeth that are about the same size. She put one tooth in a cup of cola, one in a cup of apple juice, one in a

cup of orange juice, and one in a cup of distilled water. In a month, she will see what has happened to each of the teeth.

What is the control in this experiment?

• cola and tooth

• apple juice and tooth

• orange juice and tooth

• distilled water and tooth

Tags

NGSS.MS-LS2-1

NGSS.MS-PS1-2

These are the investigations four students are doing for a science fair.

Which student will most likely have a control group for his or her investigation?

• Roy

• Lacy

• Kinu

• Yash

Tags

NGSS.MS-LS1-5

Sergio is testing to find out what prevents or stops yeast growth. He made a mixture of yeast and yeast food. He put some of it into each of four groups of four bottles. To

one group he added a tablespoon of vinegar. To another he added a tablespoon of ammonia. To another he added a tablespoon of bleach. He covered the mouths of all

four groups of bottles with balloons.

What is the control group in this experiment?

• balloons

• bottle with vinegar, yeast and food added

• bottle with yeast and food added

• amount of yeast in the solution

Zack is testing whether temperature affects the distance a rubber band can be stretched before it breaks. He heats three rubber bands in a microwave oven. He puts

three in a jar on the kitchen counter. He puts three in the refrigerator and three in the freezer.

Which is the control group?

• rubber bands in the jar

• rubber bands in the freezer

• rubber bands in the refrigerator

• rubber bands in the microwave

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Cherise is doing an experiment to see the way rocks are affected by tumbling in water. She started by breaking up a soft rock.

Cherise puts most of the pieces of rock in a jar with some water. She shakes the jar and removes pieces of rock after 100, 200, 300, 400, and 500 shakes.

Why will she include pieces of rock that were not tumbled in her display?

Why will she include pieces of rock that were not tumbled in her display?

• to show another kind of rock

• to show how the rock looks before tumbling

• because all of the original rock should be used in the experiment

• because the table will not be complete unless all of the pieces of rock are used