Variables & Scientific Method

A scientist was trying to see if the amount of water a plant gets affects plant growth. She collected 10 identical plants and gave them different amounts of water. She measured their daily growth. The plants received the same amount of sunlight.

In this experiment what is the manipulated variable?

• The amount each plant grows

• Amount of sunlight each plant is exposed to

• Amount of water given to each plant

• That all 10 plants were identical

A scientist was trying to see if the amount of water a plant gets affects plant growth. She collected 10 identical plants and gave them different amounts of water. She measured their daily growth. The plants received the same amount of sunlight.

In this experiment what is the responding variable?

• The amount each plant grows

• Amount of sunlight each plant is exposed to

• Amount of water given to each plant

• The mass of fertilizer given to each plant

A scientist was trying to see if the amount of water a plant gets affects plant growth. She collected 10 identical plants and gave them different amounts of water. She measured their daily growth. The plants received the same amount of sunlight.

Select ALL of the controlled variables

• Amount of sunlight each plant is exposed to

• That all 10 plants were identical

• Amount of water given to each plant

• The amount each plant grows

Scientists were trying to determine if feeding them junk food would cause a mouse to gain weight. 10 mice were given junk food and 10 mice were given mouse chow. The mice were weighed daily.

The manipulated variable would be:

• Food that was given to the mice

• The amount of weight gained by each group of mice

• That all mice were the same age

• All mice were genetically similar

• The 10 mice that were given mouse chow

Scientists were trying to determine if feeding them junk food would cause a mouse to gain weight. 10 mice were given junk food and 10 mice were given mouse chow. The mice were weighed daily.

The two controlled variables would be:

• Food that was given to the mice

• The amount of weight gained by each group of mice

• That all mice were the same age

• All mice were genetically similar

• The 10 mice that were given mouse chow

Scientists were trying to determine if feeding them junk food would cause a mouse to gain weight. 10 mice were given junk food and 10 mice were given mouse chow. The mice were weighed daily.

The responding variable would be:

• Food that was given to the mice

• The amount of weight gained by each group of mice

• That all mice were the same age

• All mice were genetically similar

• The 10 mice that were given mouse chow

Scientists were trying to determine if feeding them junk food would cause a mouse to gain weight. 10 mice were given junk food and 10 mice were given mouse chow. The mice were weighed daily.

The control group would be:

• Food that was given to the mice

• The amount of weight gained by each group of mice

• That all mice were the same age

• All mice were genetically similar

• The 10 mice that were given mouse chow

A scientist was trying to determine if a shape of hot air balloons impacted how high they went. The shape of 10 hot air balloons was varied. 5 were cones while 5 of them were round. The altitude (how high they went) was measured.

The responding variable would be:

• The shape of the balloons

• The maximum altitude each balloon reached

• Weather conditions were the same for each balloon flight

• The air inside each balloon was identical

• The 5 cone shaped balloons

A scientist was trying to determine if a shape of hot air balloons impacted how high they went. The shape of 10 hot air balloons was varied. 5 were cones while 5 of them were round. The altitude (how high they went) was measured.

The two controlled variables would be:

• The shape of the balloons

• The maximum altitude each balloon reached

• Weather conditions were the same for each balloon flight

• The air inside each balloon was identical

• The 5 cone shaped balloons

A scientist was trying to determine if a shape of hot air balloons impacted how high they went. The shape of 10 hot air balloons was varied. 5 were cones while 5 of them were round. The altitude (how high they went) was measured.

The manipulated variable would be:

• The shape of the balloons

• The maximum altitude each balloon reached

• Weather conditions were the same for each balloon flight

• The air inside each balloon was identical

• The 5 cone shaped balloons