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Cara read an article on why repetition and replication are so important, but she did not understand the difference between them. Which of the following best explains the two terms?

• a. Repetition is when a scientist repeats an experiment; replication is when a scientist conducts an experiment on genetic material.

• b. Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment.

• c. Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results.

• d. Repetition is when a scientist commits an error in an experiment the first time and must repeat it; replication is when a scientist repeats an experiment to make sure it is valid.

Experiments are often repeated many times by the same or different scientists. What is the most important reason more than one scientist should conduct an investigation using the same methods?

• a. If the results are the same, replication of the investigation helps to confirm the results.

• b. The competition makes the scientists work more carefully.

• c. More than one scientist is interested in the problem.

• d. Different scientists might perform the experiment differently.

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NGSS.MS-PS2-5

Scientists frequently repeat the experiments of others scientists. Why is this important in science?

• a. Scientists often ask each other for help in performing experiments.

• b. Replication of experiments helps to confirm and verify results.

• c. Scientists frequently perform other scientists’ experiments in order to practice their technique.

• d. Repeating experiments is an effective way to make sure a laboratory is in optimal condition.

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NGSS.MS-LS2-4

List the steps of the scientific method

d

e

f

c

b

a

Analyze results

Draw conclusions

Communicate results

Conduct experiment

Form a hypothesis

Ask a question

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NGSS.MS-PS2-2

Which letter represents amplitude? (a)  

• A

• B

• C

• D

• E

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NGSS.MS-PS4-1

Which phrase defines a scientific theory?

• an untested idea

• an educated guess

• an accepted description

• a well-supported explanation

Randy places a piece of metal in 3 different acids and water. Why does he need the water?

• to compare the affect of acids to it.

• to see what happens to the metal.

• to see how acid rain affects the metal.

• to compare the affect of the acids on the metal.

Colleen wants to find out if watering plants more often produces more leaves. What is the test variable?

• number of leaves

• number of plants

• amount of plant growth

• amount of water

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

Colleen wants to find out if watering plants more often produces more leaves. What is the outcome variable?

• the number of leaves

• the number of plants

• the amount of plant growth

• the amount of water

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

Science determines results based on _____________________.

• Rumor

• Hypothesis

• Evidence

• Popular opinion

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NGSS.MS-LS1-4

NGSS.MS-PS1-2