Controlled Experiments Introduction

What are Mark and Molly trying to figure out?

• How much water their plants need

• How much sunlight their plants need

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

NGSS.MS-LS2-1

In a week, how much water is Mark giving his plant?

• 300 mL (millileters)

• 100 mL (millileters)

Tags

NGSS.5-LS1-1

In a week, how much water did Molly give her plants??

• 300 mL (millileters)

• 100 mL (millileters)

There's a problem with this experiment that makes the results unreliable (not trustworthy). What's the problem?

(Hint: Think about how the experiment was set up)

Tags

NGSS.MS-ETS1-4

What did Mark and Molly do wrong?

• They gave the plants different amounts of water AND different amounts of sunlight

• They gave the plants different amounts of water and the same amount of sunlight

Tags

NGSS.MS-LS1-5

What is the independent variable?

• The things that stay the same in an experiment

• The one thing that is changed in an experiment

Tags

NGSS.MS-PS2-2

What is the purpose of doing multiple trials?

Tags

NGSS.MS-ETS1-3

NGSS.MS-ETS1-4

What is a controlled experiment?

• An experiment that keeps everything the same except for one variable

• An experiment that changes multiple variables