What is the manipulated, responding, and controlled variable in this lab?
Independent Variable (aka. ‘manipulated variable’): I can actually think of two, depending on how you did the experiment, and what the point of it was. Firstly, the solution into which the potato pieces are placed is going to be an independent variable, i.e. sucrose, distilled water. Secondly, another independent variable could be the starting weight of the potato pieces. But I get the feeling that the only independent variable you were concerned with was the solution, though Im not a mindreader Dependent Variable (aka ‘responding variable): The change in weight following the 2 day treatment. This is going to represent the volume of water that has travelled osmotically across the membranes of the cells. Your controlled variables will be any variables that were kept constant across all of the trials. In other words, any factors that could have influenced the dependent variable, because we are only interested in how the independent variable has influenced the dependent variable. We want
