What is one controlled variable in this experiment?

A controlled variable is one which the researcher holds constant during an experiment. It is not part of an experiment, but it is important because it can have an effect on the results. Any given experiment has numerous control variables.

Examples of controlled variables could be the amount of light or the duration of an experiment. It could also be whether a particular fertilizer has an effect on plant growth. The managed variable in this experiment is the amount of fertilizer given to the experimental group.

The amount of time it takes for the corn to grow is also a controlled variable in scientific experimentation. The experimental element is constant and unchanged throughout the course of the investigation.