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.
In a nutshell: A control group is a group in a scientific study that is given nothing special to compare it with a group given something scientists are testing. Control group studies help scientists test a claim that one thing causes another. Many scientists use control groups when testing new medicines.