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.
A way to test a hypothesis by testing a single variable by changing it while keeping all other variables the same. Manipulated variable: The factor in an experiment that is deliberately changed to test the hypothesis. Controlled variable: any factor during an experiment that a scientist purposely keeps the same.