What do the bladders on the bladderwort do?

The bladders on the bladderwort, a carnivorous plant, function as specialized traps for capturing small aquatic prey, such as insects and tiny crustaceans. Each bladder contains a vacuum that creates a low-pressure environment; when prey triggers the trapdoor, water rushes in, sucking the prey inside. This mechanism allows the plant to digest the captured organisms, providing essential nutrients in nutrient-poor environments.