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 control group is the group that is controlled in the experiment so that you know what the outcome will be. This way you can compare the results to the test group to measure your outcome. Without a control group, you would not be able to test, compare, or measure your results. Great answers above.