Question

You water three sunflower plant with salt water. Each plant receives a different concentration of salt solutions . A fourth receives pure water. After a two -week period, the height is measured . What is the independent, dependent and controlled variable.

Answer 1

Answer:

Independent - Water/Type of water (salt and pure)

Dependent - Height of plant

Controlled - Amount of water

Explanation:

Independent is what the experimenter manipulates (in this case being the type of water.)

Dependent is what the experimenter measures and is a result of the independent (in this case being the height of plant)

Controlled is what you are trying to keep the same (in this case the amount of water you give each plant.)

Answer 2

In the experiment given, the independent variable is the salt water, the dependent variable is the height of each plant, and the sunflowers are the control variable.

Variables in an experiment can be one of three kinds:

• Control
• Dependent
• Independent

The dependent variable is the variable that will change based on the other variables, this is often what the experiment seeks to measure. In the case given, the variable that will be measured is the height of the plants, therefore this is the dependent variable.

The independent variable is one that will not depend on the other variables in the experiment. Since the salt water used for each plant does not depend on the kind of plant or on its height, we can infer that the salt water is the independent variable of this experiment.

The control variable is the variable that remains constant in an experiment in order to not affect the outcome. Since for each case in this experiment there is no difference in the kind of plant that is used, we can say that the sunflower plant is the control variable.

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