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.
When conducting experiments, a critical part is to test hypotheses against each other. Thus, it is an important part of the statistics tutorial for the scientific method. Hypothesis testing is conducted by formulating an alternative hypothesis which is tested against the null hypothesis, the common view.