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 purpose of a research study conducted by the author was to establish how statements of suspects change in pre-trial trial procedure and trial, what are the reasons for these changes, what is their role for the position of a defendant and what can be done to avoid mistakes in interviews and interrogation.