SC 7 N 1 4

Jason states the following prediction: “As the air temperature increases, the air in a balloon will expand, increasing the circumference of the balloon.” Some of Jason’s observations during his experiment are shown below. Which of the following is the outcome variable (dependent variable) for an experiment designed to test Jason’s prediction?

• a

• b

• c

• d

Tags

NGSS.MS-PS1-4

Kaylee reads an article that states that the frequency of chirping by crickets is related to the temperature of their environment. She wants to conduct an experiment to see if this is true. Kaylee states this hypothesis: Crickets chirp more frequently when the temperature of their environment increases. What is the test variable (independent variable) and outcome variable (dependent variable) in Kaylee’s experiment?

• test variable (independent variable): number of crickets; outcome variable (dependent variable): frequency of chirping

• test variable (independent variable): temperature of environment; outcome variable (dependent variable): frequency of chirping

• test variable (independent variable): number of crickets; outcome variable (dependent variable): temperature of environment

• test variable (independent variable): frequency of chirping; outcome variable (dependent variable): temperature of environment

Tags

NGSS.MS-ETS1-1

Which method is best for determining scientifically which of two fertilizers is most effective for raising tomato plants?

• Treat two different varieties of tomato plants individually with the different fertilizers and measure their growth and appearance. Compare differences in the growth of individual plants.

• Apply one type of fertilizer to a group of similar tomato plants and apply a different type of fertilizer to a different group of similar tomato plants and compare the growth and appearance of both groups.

• Use one type of fertilizer on a group of different varieties of tomato plants and measure their growth and appearance. Compare their growth to a group of plants that were not treated with the fertilizer.

• Mix the two types of fertilizers and apply the mixture to one variety of tomato plants and measure their growth and appearance. Compare their growth and appearance to a group of tomato plants that were not treated with the mixture.

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

A group of students investigate the effect of carbon dioxide on plant height. The students grow plants in several closed containers. All the plants receive the same amounts of water and light, but the air in each container has a different amount of carbon dioxide. What is the test variable (independent variable) in this experiment?

• height of each plant after a period of time

• amount of carbon dioxide in each container

• amount of air in each container

• amount of water provided to the plants

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Eddie wants to determine if different colored boxes produce the same temperature inside as a white box. He places white, black, and red boxes of the same size in the sunlight. A thermometer is placed inside each box. He observes and records the temperatures in the boxes throughout the day. What is the test variable (independent variable) in this investigation?

• size of the boxes

• repeated trials

• color of the boxes

• recorded temperatures

Tags

NGSS.MS-PS1-4

Other than scientific experiments, what other methods do scientists use to investigate problems?

• Models, Observations, & Research

• Models, Observation, & Replication

• Models, Repetition, & Replication

• Models, Repetition, & Variables

Tags

NGSS.MS-LS1-1

Science determines results based on _____________________.

• Rumor

• Hypothesis

• Evidence

• Popular opinion

Tags

NGSS.MS-PS1-2

Scientists sometimes change their views. For example, people once believed that Pluto was a planet. What causes these changes in thinking?

• new experiments

• new evidence or interpretations

• new scientific beliefs

• new theories develop

Tags

NGSS.HS-LS4-2

NGSS.HS-PS4-3

Which one is a limitation of a drawing but not a model of the cell?

• it does represent the main parts of a cell

• it does not contain the correct number of nuclei

• it cannot represent a true cell which is 3 dimensional

• it cannot represent a true cell since the cytoplasm should be in constant motion

Tags

NGSS.MS-LS1-2

What is a scientific model?

• A representation of an object, but smaller

• An exact representation made of similar material

• A representation of an object or system

• A familiar copy of an object

Tags

NGSS.MS-ESS2-1

NGSS.MS-LS1-2

NGSS.MS-PS1-1