Scientific Variables Practice 1

The dependent variable in this experiment is - 

• Number of Bacteria
• Time of Incubation
• Culture Number
• Type of Bacteria

Identify the problem with this experiment:  
A scientist thinks that flatworms swim faster if they are in salt water.  So he drops them in salt water and finds that they do swim very fast.  He concludes that salt water makes flatworms swim fast.  

• No independent variable
• Too many independent variables
• No control group
• No experimental group

The control group always lacks the 

• Dependent Variable
• Independent Variable
• Constants
• Poopy Face Tomato Nose 

Tags

NGSS.MS-LS1-5

The following statement is a hypothesis formed about marsh grass: 
If the amount of nitrogen marsh grass receives is increased, then the height of the grass will increase, because nitrogen is an essential nutrient needed for marsh grass to grow.
What is the independent variable of the statement above? 

• Height of grass
• Amount of nitrogen
• Essential nutrient
• Amount of growth

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

 Sandy is conducting an investigation to find out which food his dog likes best. Which is the manipulated variable in his investigation?

• The color of his dog’s food dish
• The kind of food he gives his dog
• The amount of food he gives his dog
• The time of day he feeds his dog

Nick wanted to see how high an ice cube would float in different temperatures of water. Identify the DEPENDENT variable
-Amount of water
-Height of Ice cube
-Temperature the ice cube was at its highest height
-Temperature of the water
-Size of the ice cube

• Amount of water 
• Height of Ice cube
• Temperature the ice cube was at its highest height 
• Size of the ice cube

Tags

NGSS.MS-PS2-2

Mario studied how far room temperature water would spurt out of a plastic milk carton when 3mm holes were punched at different heights from the bottom of the container. Identify the DEPENDENT variable
-3mm holes
-Distant water traveled out of carton
-Different heights of the holes in the container
-Ice water from Iceland

• 3mm holes
• Distant water traveled out of carton
• Different heights of the holes in the container 
• Ice water from Iceland

A scientist hypothesizes the the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The independent variable is

• the male alligators
• the incubator
• the gender of the alligator
• the temperature

Tags

NGSS.MS-LS1-5

In this graph, what is the independent variable? 

• Population
• Day
• Species 5

Tags

NGSS.MS-LS2-1

In this graph, what is the dependent variable? 

• Walla Walla Island
• Time
• Number of Deer

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4