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.
The test environment is required to share some resources with the development environment, such as Bug Tracking and Configuration Management. Typically, access to such shared resources is controlled through a firewall. In some cases, the system testing environment might also be used as a staging environment.