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.
How to Find the Power of a Statistical Test. When a researcher designs a study to test a hypothesis, he/she should compute the power of the test (i.e., the likelihood of avoiding a Type II error). To compute the power of a hypothesis test, use the following three-step procedure. Define the region of acceptance. Previously, we showed how to compute the region of acceptance for a hypothesis test.