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.
Make sure that testing environments resemble production systems to the greatest extent possible. The greater the differences between the test environment and the production environment, the less effective the test environment becomes at predicting what will happen in production. Automate testing. For important components use automated testing methods, either with continuous integration systems or by some other means, to ensure that most routine testing is ongoing and does not require active developer initiative.