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.
In experiments, controls are factors that you hold constant or don't expose to the condition you are testing. Although control variables and the control group are the same in this respect, the terms refer to two different things. A control variable is any factor you control or hold constant during an experiment. A control variable is also called a controlled variable or constant variable.