IB Biology Skills: Validity 1

The video tutorial covers the concept of validity in IB Biology experiments, focusing on the roles of independent, dependent, and controlled variables. It uses examples from an archery competition and a catalase activity experiment to illustrate how these variables affect the validity of conclusions. The tutorial emphasizes the importance of changing only one independent variable at a time to ensure valid results and discusses how to select appropriate dependent variables. It also highlights the need to maintain controlled variables to draw meaningful conclusions.

How does the concept of validity apply to the activity of catalase in the experiment described?

Why is it necessary to have only one independent variable in an experiment?

What could be the consequences of measuring an inappropriate dependent variable?

In the context of the archery competition, what would be considered a controlled variable?