is bladderwort a producer of a consumer. An animal that can't produce its own food and it eats plants and other animals. That is what a consumer is.
If it is; What is the purpose of a control in verifying a hypothesis or conducting an experiment, it is: Controls are needed to eliminate alternate explanations of experimental results. That is in order to test a particular variable you need a control. For e.g.
The central reason we do hypothesis testing is to decide whether or not the sample data are consistent with the null hypothesis. In the second step of the procedure we identify the kind of data that is expected if the null hypothesis is true. Specifically, we identify the mean we expect if the null hypothesis is true.