Independent and Dependent Variables

Independent and Dependent Variables

1.  A cow is given a growth hormone and then compared to another cow that was not given a growth hormone.  Both cows were weighed at 2 years.

Multiple Choice

Independent

• growth hormone

• weight of cow

• cows

Multiple Choice

Dependent

• growth hormone

• weight of cow

• cows

2.  Mosquito repellent is sprayed on one arm and the other arm is not sprayed.  The number of mosquito bites is counted after 2 hours.

Multiple Choice

Independent

• mosquito bites

• repellant

• 2 hours

Multiple Choice

Dependent

• mosquito bites

• repellant

• 2 hours

3.  One grape is placed in tap water and another grape is placed in salt water. The change in their mass is measured after a day.

Multiple Choice

Independent

• salt water

• mass of grapes

• type of water

Multiple Choice

Dependent

• salt water

• mass of grapes

• type of water

4.  Two different cars are traveling at 60 mph.  At a certain point, both cars slam on the brakes.  The distance it takes for each car to stop is then measured.

Multiple Choice

Independent

• speed of cars

• type of car

• stopping distance

Multiple Choice

Dependent

• speed of cars

• type of car

• stopping distance

5.  Pillbugs are placed in a container where they have a choice of a wet or a dry environment.  Researchers record how much time was spent on each side.

Multiple Choice

Independent

• container

• environment

• time spent

Multiple Choice

Dependent

• container

• environment

• time spent

6.  A stapler is used to staple 100 papers, it jams 5 times during the trial. A different brand of stapler performs the same test; it jams 22 times.

Multiple Choice

Independent

• type of stapler

• 100 papers

• number of jams

Multiple Choice

Dependent

• type of stapler

• 100 papers

• number of jams

8.  Two plants are grown using the same light and pots.  One plant is given water that has been microwaved and the other plant is given regular tap water.  Their height is measured after 2 weeks.

Multiple Choice

Independent

• height of plant

• type of water

• microwave

Multiple Choice

Dependent

• height of plant

• type of water

• microwave

9. The blood pressure of a soldier is measured while he is resting.  The soldier is then exposed to a stressful environment and his blood pressure is measured again.

Multiple Choice

Independent

• soldier

• blood pressure

• stress

Multiple Choice

Dependent

• soldier

• blood pressure

• stress

10. An apple is cut into slices. Half of the slices are sprayed with lemon juice. All slices are stored in a sealed plastic bag. After 4 days, they are observed to see how brown they turned. 

Multiple Choice

Independent

• browning

• lemon juice

• type of apple

Multiple Choice

Dependent

• browning

• lemon juice

• type of apple

11.The respiration rate of a goldfish is measured. The goldfish is then placed in cold water and the respiration rate is measured again. 

Multiple Choice

Independent

• type of fish

• temperature

• respiration rate

Multiple Choice

Dependent

• type of fish

• temperature

• respiration rate

12.  Bacteria are grown in a petri dish. One side of the dish is sprayed with an antibiotic.  After a week, the number of bacteria colonies are counted on each side.

Multiple Choice

Independent

• petri dish

• number of colonies

• antibiotic

Multiple Choice

Dependent

• petri dish

• number of colonies

• antibiotic