Control Experiment

What is Control Experiment?

A second set-up that is identical to the treatment in every respect except the one variable being investigated. Its purpose is to rule out alternative explanations, so that any difference in the result can be attributed to that single variable. In the carbon dioxide investigation the control is a sealed plant with carbon dioxide still available, matched to the treatment for plant, light, temperature, water and duration.

This definition is part of the Plant Nutrition chapter in Cambridge O Level Biology.

Concepts related to Control Experiment

• Controlled Variable
• valid conclusion
• Destarching
• carbon dioxide absorber