Controlled Variable

What is Controlled Variable?

A factor deliberately kept the same throughout an investigation so that it cannot affect the result. Any factor left free to vary alongside the independent variable becomes an alternative explanation for the outcome, so the conclusion can no longer be attributed to the factor being tested.

This definition is part of the Coordination and Response in Plants chapter in Cambridge O Level Biology.

Concepts related to Controlled Variable

• validity
• Control Experiment
• fair test