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.
controlled experiment. a component of the process of science whereby a scientist carries out two parallel tests, an experimental test and a control test. the experimental test differs from the control by one factor, the variable. technology. application of scientific research to society's needs and problems.