Nature of Science Review

Scientists want to determine if how loud music is played affects a person's blood pressure. Which variable should change in the experiment?

• the type of music played

• the amount of time the person hears the music

• the volume of music played

• the tools used to test the blood pressure

Shayla observes the change from caterpillar to butterfly. She draws and labels each phase and shares her drawings with the class. Which statement BEST describes Shayla's investigation?

• It involves modeling.

• It involves experimentation.

• It involves repeated observations.

• It involves both experimentation and repeated observation.

Jermaine uses cell phone Internet service from provider A. Ricardo uses Internet service from provider B. How can Jermaine and Ricardo determine in a scientific way which Internet company has faster download speeds?

• Read information from each Internet service provider.

• Use a timer to find out how long it takes to download the same game.

• Have each student download a different game and compare the time it took.

• Ask ten friends who use each Internet service which one is faster.

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Chen counts the number of people who visit the community pool each day for 1 week. He displays his data using a bar graph. How many more people did Chen observe at the pool on Friday than on Thursday?

• 19

• 200

• 100

• 90

Teresa has been growing plants without fertilizer. Now, she wants to see what happens to the plants when the amount of fertilizer is increased, as shown in the chart. Which plant is the control?

• 1

• 2

• 3

• 4

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If an investigation was done using these birds, which is the BEST possible conclusion?

• Since the bird on the top weighs more, it flies faster.

• The bird on the bottom is more attractive.

• The bird on the bottom flew from perch A to perch B faster over 10 trials, so it flies faster.

• The bird on the top flew from perch A to perch B faster one time, so it flies faster.

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Which is an opinion?

• The boiling point of water is 100 degrees Celsius.

• Blue is the best color for parrot fish.

• Bats use sonar to fly at night.

• The ball rolled 10.2 feet over four tries.

For what can scientists use the data in the graph?

• evidence

• opinion

• conclusion

• investigation

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What is NOT a possible observation of salmon swimming upstream to spawn?

• Salmon start their spawning season in the fall.

• Bears easily prey on salmon as they swim upriver.

• The average weight of a spawning salmon is 7.2 pounds.

• Most of the salmon seem to be of adult size.

Why do scientists publish the results of their investigation in science journals?

• They want to show other scientists what they are doing wrong.

• It is a requirement for being a scientist.

• They want others to support their opinions.

• They communicate and share their findings so that scientific knowledge grows.