Question

science 8
unit 1: scientific inquiry
g) do plants grow better in white light?

• independent variable:
• dependent variable:
• controlled variables (3):
• control group:

h) does a certain muscle cream double a persons muscle power when used as a part of a muscle - building workout?

• independent variable:
• dependent variable:
• controlled variables (3):
• control group:

i) do mice that eat food exposed to microwaves become smarter and would be able to run through a maze faster?

• independent variable:
• dependent variable:
• controlled variables (3):
• control group:

Explanation:

Step1: Identify variables for plant - light experiment

Independent variable is the type of light, so for plants and white light, it's the presence or absence of white light. Dependent variable is what is being measured which is plant growth. Controlled variables could be plant type, soil type, amount of water. Control group is plants not exposed to white light (e.g., plants in other types of light or in dark).
Independent variable: Type of light (presence of white light)
Dependent variable: Plant growth
Controlled variables (3): Plant type, soil type, amount of water
Control Group: Plants not exposed to white light

Step2: Identify variables for muscle - cream experiment

Independent variable is the use of muscle cream. Dependent variable is muscle power. Controlled variables could be workout routine, diet, starting muscle strength. Control group is people in muscle - building workout not using the muscle cream.
Independent variable: Use of muscle cream
Dependent variable: Muscle power
Controlled variables (3): Workout routine, diet, starting muscle strength
Control Group: People in muscle - building workout not using the muscle cream

Step3: Identify variables for mice - microwave experiment

Independent variable is whether mice eat food exposed to microwaves. Dependent variable is the intelligence and speed of mice (time to run through maze). Controlled variables could be mouse type, age of mice, type of maze. Control group is mice that eat non - microwaved food.
Independent variable: Whether mice eat food exposed to microwaves
Dependent variable: Mouse intelligence and speed (time to run through maze)
Controlled variables (3): Mouse type, age of mice, type of maze
Control Group: Mice that eat non - microwaved food

Answer:

g) Independent variable: Type of light (presence of white light)
Dependent variable: Plant growth
Controlled variables (3): Plant type, soil type, amount of water
Control Group: Plants not exposed to white light
h) Independent variable: Use of muscle cream
Dependent variable: Muscle power
Controlled variables (3): Workout routine, diet, starting muscle strength
Control Group: People in muscle - building workout not using the muscle cream
i) Independent variable: Whether mice eat food exposed to microwaves
Dependent variable: Mouse intelligence and speed (time to run through maze)
Controlled variables (3): Mouse type, age of mice, type of maze
Control Group: Mice that eat non - microwaved food