TEST - CP_Unit 1 - Science Practices

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. Dependent variable:

• growth hormone
• weight

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

• presence of mosquito repellent
• number of bites

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. Independent variable:

• type of water
• mass of grape

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 Independent variable:

• wet or dry environment
• time spent on each side

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. The number of jams is the...

• independent variable
• dependent variable

In a scientific experiment, a researcher wants to investigate the effect of temperature on the growth of plants. Dependent Variable:

• The growth of plants
• The temperature

In a survey, a researcher wants to determine if there is a relationship between income and happiness. Dependent variable:

• The income
• The happiness

Students investigate if heart rate if effected by the amount of exercise. The heart rate is:

• independent variable
• dependent variable

Person sets out to see if the higher the temperature of the air in the oven, the faster a cake will bake. Dependent variable:

• temperature
• time of cake to bake

A student wanted to test how the mass of a paper airplane affected the distance it would fly. Paper clips were added before each test flight. As each paper clip was added, the plane was tested to determine how far it would fly: The distance traveled is

• independent variable
• dependent variable