You perform an experiment in which you take 16 pots of strawberry plants and give half of them 1 gram of ammonium nitrate per liter of water and the other half just get water. Each group is then split in half again, and exposed to either 8 or 16 hours of light each day. You monitor the height of the plants for four weeks. You observe that increasing ammonium nitrate and light both increase plant height.
-Which of the following is an (are)independent variable(s)in this experiment?

Question

Quizplus · Accepted Answer

An independent variable is a variable that is changed or controlled in a scientific experiment to test its effects on the dependent variable. In this experiment, the amount of ammonium nitrate and the amount of light are both independent variables that are being manipulated to observe their effects on the height of the plants, which is the dependent variable. The height of the plants and the amount of light are not independent variables because the amount of light is already being controlled and manipulated. The amount of ammonium nitrate is also not the only independent variable because the amount of light is also being controlled and manipulated.

You Perform an Experiment in Which You Take 16 Pots