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 using control and manipulation on the variables of the experiment is to see if the variables that are being manipulated have an effect on the results, or data. This way, scientists can text hypothesis and analyze outcomes to make new inferences from the research.