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.
Control groups are an important part of many scientific experiments. Researchers use control groups to find out if a treatment really has an effect. Sometimes, study subjects act differently after treatment just because they know they got treated. For example, imagine this scene. You go to your doctor and tell her that you can't sleep at night.