Question

1. drag and drop the descriptions with the variables.

these variables do not change in an experiment.
this value changes in response to the independent variable.
scientists change this variable on purpose.

Explanation:

• Control variables: These are kept constant throughout an experiment. Their lack of change helps in isolating the effect of the independent variable on the dependent variable. For example, if you are testing how the amount of sunlight (independent variable) affects plant growth (dependent variable), the type of soil, amount of water, etc., would be control variables.
• Dependent variables: Their values are determined by the independent variable. In a simple equation \(y = mx + c\), \(y\) is the dependent variable (it changes based on the value of \(x\) - the independent variable). In an experiment, if you change the temperature (independent variable) and measure the rate of a chemical reaction (dependent variable), the rate of reaction depends on the temperature.
• Independent variables: Scientists manipulate these variables intentionally. For instance, in an experiment to see how different fertilizers affect plant height, the type of fertilizer is the independent variable that the researcher chooses to change.

Answer:

• "These variables do not change in an experiment." → control
• "This value changes in response to the independent variable." → dependent
• "Scientists change this variable on purpose." → independent