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.
Test Your Dexterity Online. Control Panel. The purpose of the test is to click all the numbers, in ascending order, as fast as possible. If you have lost valuable seconds at the beginning of the game, you can restart the test. Other online games.