Biology Experimental Design and Variables

This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable

• independent variable

• data

• control group

Tags

NGSS.MS-PS2-2

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant

• The amount of sunlight

• The type of music

• The type of liquid

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and container. In this investigation, what are the controlled variables?

• Type of plant, sunlight, type of container

• Water, apple juice, milk

• Plant growth

Tags

NGSS.MS-LS2-1

Match the following experimental variables

• Group in an experiment that receives the treatment

• Experimental group

• Group in an experiment that does not receive the treatment

• Control group

• Variable that is manipulated in an experiment

• Depenent variable

• Variable that is measured or observed in an experiment

• Independent variable

• Predicted explanation for a phenomenon

• Hypothesis

Tags

NGSS.MS-PS2-2

This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted. 

• experimental group

• control group

• data

• variables

Testing a hypothesis often involves a(n):

• answer

• experiment

• problem

• safety check

Tags

NGSS.MS-PS1-2

A student wants to test the effects of type of exercise on heart rate.  What is the dependent variable?

• heart rate

• type of exercise

• amount of exercise

• time of day exercise occurs

Why do we want to test one variable at a time?

• Because it is hard to setup a data table with more

• To know what is causing the changes

• It is what has always been done

• No one really knows

The variable the is changed on purpose is..

• Constant

• Control

• Independent Variable

• Dependent Variable

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

What is the INDEPENDENT  variable (cause) is this experiment? 
"Which type of medium is best for plant growth?" 

• height of plant (cm)

• type of medium (soil vs. sand)

• amount of medium

• types of plant

Tags

NGSS.MS-LS1-5