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.
Positive scientific control groups are where the control group is expected to have a positive result, and allows the researcher to show that the set-up was capable of producing results. Generally, a researcher will use a positive control procedure, which is similar to the actual design with a factor that is known to work.