Question

Eva is performing an experiment to determine which type of disinfectant kills the most bacteria. She has six plates of the same kind and amount of bacteria. She adds one of five different kinds of disinfectant to each plate and leaves one plate without any disinfectant as a control.
What role does the independent variable play in this experiment?

Answer 1

The  answer is the type of disinfectant determines the amount of bacteria killed.

Hope this helps. 

Answer 2

Answer:

Effect of independent variable is studied on the dependent variable or subject of the experiment.

Explanation:

The independent variables are very important in an experiment. Basically the affect of an independent variable is studied on the subject or dependent variable.

Thus, it can be said that independent variable will produce the effect on the dependent variable.

Here in this case the different types of disinfectants are the independent variable and their effect will be  observed on the bacteria (subject or dependent variable)