SC.5.N.2.2

Lauren is investigating the way plant stems transport liquids. She puts a white flower in a glass of water and then adds red food coloring to the water. She concludes that the colored water moved up the stem to the flower petals. If the conclusion is correct, what should happen if Lauren repeats the experiment?

• She should get the same results

• She will follow a new procedure

• She should use a different kind of flower

• She will probably make different observations

Tags

NGSS.MS-LS2-3

Allison is studying constellations. On a clear night, she sketches the constellations she sees at different times. She concludes that the constellations appear to move in the night sky. If this conclusion is correct, what should happen if Allison repeats the investigation?

• She should reach a new conclusion

• She should make similar observations

• She should choose different constellations

  to study.

• She should form an opinion about her favorite

  constellation.

Tags

NGSS.MS-ESS1-1

Yoshi is investigating the way surface area affects the evaporation of water. She pours the same amount of water into a shallow dish and into a tall, narrow jar. She measures the volume of water left after a few days. What is the best reason for Yoshi to record her steps and results carefully?

• The experiment will still work if it is cloudy

• She does not need to do the experiment again

• No one else will have to carry out the experiment

• Another student can repeat the experiment to check the results

Harry is investigating magnets. He wants to find out whether a magnet can pick up a paper clip through paper, glass, and other materials. What is the best reason for recording his steps and results carefully?

• No one will question his conclusions

• Someone else can repeat the experiment

• People might think he just made up the results

• He may not remember what materials he tested

Tags

NGSS.3-PS2-1

NGSS.3-PS2-3

Lauri is comparing the forces needed to pull a toy car up a ramp at different heights. She uses stacks of books to change the height of the ramp and then she measures the

force with a spring scale.

What is the best reason for several other students to repeat

this experiment?

• to change the results

• to make a new prediction

• to get enough data for a graph

• to check that the results are correct

Debbie is experimenting with static electricity. She rubs a balloon on the carpet and then records how long the balloon sticks to the wall. What is the best reason another person should repeat this experiment?

• to make sure the results are accurate

• to find out if static electricity is dangerous

• to check that she did not use glue or tape

• to check that she recorded her data correctly

Fred is experimenting with electrical circuits. He connects three bulbs to a battery using this set up. What is the best reason for Fred to make an accurate drawing of his experimental set up?

• so he will not get an electrical shock

• so that all three bulbs will light up together

• so someone else can repeat the experiment

• so he can make a prediction before he starts

Hamil is investigating how adding salt to water changes the amount of time it takes water to boil. He concludes that it takes longer for the water containing salt to boil. However, he does not record how long it took for the water to boil or the amounts of water and salt he used. What is the best reason the results of Hamil’s investigation are not very useful?

• He did not record a prediction.

• Someone else might want to test a

  different variable

• He did not use the correct safety procedures.

• Someone else could not repeat his experiment

  to check his results

Chim drew this picture of what he observed after putting a pencil in a glass of water. He concluded that the light rays were bent as they passed from the air to the water. Why should another student do the same experiment again?

• to make a new prediction

• to use pencils of different lengths

• to try water at a different temperature

• to check that the results are the same

Tags

NGSS.MS-PS4-2

Suzanne is experimenting to find out what makes some objects float and others sink. She fills an aquarium with water and tries many different objects. She tries to use objects with about the same volume. What is the best reason for Suzanne to describe the objects accurately?

• so she can make a graph

• so her experiment can be repeated

• so she does not use two objects that are

  the same

• so she can compare her conclusion

  with her prediction

Tags

NGSS.MS-ETS1-1