Planning and Carrying Out Investigations

When you plan an investigation, it must be a 'fair test' so the results are valid. What is a fair test?

• An experiment that has been done more than once

• An experiment that has been repeated

• An experiment that has been done accurately

• An experiment where only one thing has been changed

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-5

In a fair test, the one thing (variable) that is changed by the person doing the experiment is called the

• independent variable

• dependent variable

• control variable

• only variable

Tags

NGSS.MS-PS2-2

In a fair test, only one variable is changed. All the other variables must be kept the same. These variables are called:

• independent variables

• dependent variables

• control variables

• only variables

Tags

NGSS.MS-PS2-2

In an investigation, the dependent variable is

• The variable that you change

• The variable that you keep the same

• The only variable in the experiment

• The variable that is measured or counted

A class of year 7 students want to find out how the amount of water affects the number of cress seeds that germinate. What is the independent variable in the investigation (the variable they should change?)

• The number of cress seeds they plant

• The amount of water they add

• The number of cress seeds that germinate

• Where they leave the cress seeds

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

A class of year 7 students want to find out how the amount of water affects the number of cress seeds that germinate. What is the dependent variable in the investigation (the variable they should measure or count?)

• The number of cress seeds they plant

• The amount of water they add

• The number of cress seeds that germinate

• Where they leave the cress seeds

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

A class of year 7 students want to find out how the amount of water affects the number of cress seeds that germinate. Which of the following should be a control variable in this investigation?

• How much water they add

• How many seeds germinate

• The number of seeds they plant

• The size of the measuring cylinder

Tags

NGSS.MS-ETS1-1

NGSS.MS-LS2-1

A class of year 7 students want to find out how the size of a seed affects how far it travels. What is the independent variable?

• How far the seeds travel

• The type of seed

• The number of seeds they plant

• The size of the seeds

A class of year 7 students want to find out how the size of a seed affects how far it travels. What is the dependent variable?

• How far the seeds travel

• The type of seed

• The number of seeds they plant

• The size of the seeds

A class of year 7 students want to find out how the size of a seed affects how far it travels. What would be a control variable?

• How big the seeds are

• Where the seeds land

• how the seeds travel

• The type of seed

Tags

NGSS.MS-PS2-2