Unit 1 Nature of Science

In an experiment, 150 plants were grown under red wavelengths of light. An additional 150 plants were grown under normal light conditions. What did the plants grown under normal light conditions represent in this experiment?

• Control Group

• Data

• Test Group

• Variable

Which statement describes the difference between a test variable (independent variable) and an outcome variable (dependent variable).

• the outcome variable (dependent variable) is the result of the changes the researcher makes to the test variable (independent variable).

• the test variable (independent variable) is the result of the changes the researcher makes to the outcome variable (dependent variable).

• The outcome variable (dependent variable ) is the control and the test variable (independent variable) is the result.

• The test variable (independent variable) is the control and the outcome variable (dependent variable) provides the results, which are measured to gather data.

Tags

NGSS.MS-PS2-2

You want to find out if plants will grow more leaves if they are watered more often. You count the number of leaves on each plant before you start. You divide the plants into 2 groups, one group is watered once a day and the other group is watered 2 times a day. What is the test variable (independent variable) in your experiment?

• the type of plant being grown

• the number of leaves the plants grow

• the amount of light the plants receive

• the number of times the plants are watered.

Tags

NGSS.MS-LS2-1

Shawn read an article describing an experiment and he concluded that the experiment was valid. The reasons he thought the experiment was valid was because it included several trials and several other scientists had conducted the same experiment with similar results. Which statement BEST describes the reason Shawn accepted the results of this experiment?

• a control group was included in the experiment

• the experiment was conducted by well-known scientists.

• the experiment was subjected to both replication and repetition.

• the experiment included both independent and dependent variables.

When a scientist gives their procedure to another scientist to perform the same experiment.

• Repetition

• Replication

• Plagiarism

• Sequence

You are investigating how far a rubber band stretches when you suspend an increasing amount of weight from it. You use the same type of rubber band to test each amount of weight. The graph shows your data.

Based on this data, which variable is the outcome variable (dependent variable)?

• Band type

• Stretch

• Time

• Weight

Tags

NGSS.MS-PS2-2

How is replication different from repeated trials?

• Replications are not recorded in any kind of data chart. Repeated trials may use several data charts.

• Replications are based on observations. Repeated trials are based on evidence.

• Replication occurs when another scientist repeats an experiment. The same scientists conduct repeated trials.

• Replication requires the use of a calculator. Repeated trials require the use of a computer.

The statement from which investigation is an example of repetition?

• Investigation 1

• Investigation 2

• Investigation 3

• Investigation 4

Ecologists are studying how ladybugs are able to keep aphid numbers down in greenhouses. What is the MOST likely order of the actions performed by the ecologists?

• 4,1,2,3

• 1,4,2,3

• 1,4,3,2

• 2,3,1,4

Tags

NGSS.MS-LS2-1

Which of the following BEST describes an experiment?

• collection of data from an uncontrolled conditions and test (independent) and outcome (dependent) variables.

• procedure with controlled conditions and test (independent) and outcome (dependent) variables

• observations of animals in their natural world

• mathematical analysis of data.

Tags

NGSS.MS-PS1-2