An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid: water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, what are the controlled variables?
A
type of plant, amount of music, and sunlight
B
water, apple juice, and milk
C
plant growth
D
There are no controlled variables in this experiment
A
type of plant, amount of music, and sunlight
The controlled variables in this experiment are the variables that are kept constant or the same for all of the plants. By controlling these variables, any differences observed in the plant growth can be attributed to the different liquids used.
Looking at the options provided:
A. Type of plant, amount of music, and sunlight: These variables are not the same for all plants. Each plant is given a different liquid, but they all have the same type of plant, amount of music, and sunlight. Therefore, A is incorrect.
B. Water, apple juice, and milk: These are the different liquids that are being tested. They are not controlled variables; they are the independent variables in this experiment. Therefore, B is incorrect.
C. Plant growth: This is the dependent variable in the experiment, which is the result that is being measured. It is not a controlled variable. Therefore, C is incorrect.
D. There are no controlled variables in this experiment: This option is incorrect.
The correct answer is B. The liquids (water, apple juice, and milk) are the independent variables being tested, not the controlled variables.