Experimental design - Biology

What are all the things that are kept the same in an experiment?

• variables

• data

• constants

What is the factor that an experimenter changes on purpose?

• Dependent Variable

• Independent Variable

• Constant

The part of the experiment that does not contain the independent variable. Used for comparison.

• Control Group

• Experimental Group

When experimenting with the growth of a plant, a scientist uses the same type of plants, the same amount of light, same amount of water, and 2 different fertilizers. What type of variable is the fertilizer?

• Dependent

• Independent

• Control

• Compound

It's best to have have ____ independent variable(s) in an experiment for it to be valid.

• 1

• 2

• 3

Students used various temperatures of water to see which one dissolved candy faster. 
What was the Independent Variable?

• Amount of Candy
• Amount of Water
• Temperature of Water
• Time for Candy to Dissolve

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

In the experiment pictured, a student is testing the effect of the amount of fertilizer on plant growth.  What is the independent variable?

• amount of water
• amount of fertilizer
• the type of plant
• the size of the plant container

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

In the experiment pictured, a student is testing the effect of the amount of fertilizer on plant growth.  Which of the following is NOT a constant in the experiment?

• amount of water
• angle of light
• type of plant
• amount of fertilizer

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

In the experiment shown, plant A received 50 mL of coke each day, plant B received 50 mL of juice, and plant C received 50 mL of water.  Every day for one week, plant growth was measured.  Which group served as the control group?

• Plant A
• Plant B
• Plant C
• There was no control group

Tags

NGSS.MS-LS1-5

In the experiment shown, plant A received 50 mL of coke each day, plant B received 50 mL of juice, and plant C received 50 mL of water.  Every day for one week, plant growth was measured.  What was the independent variable?

• Plant growth
• Type of liquid
• Type of plant
• Amount of liquid

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1