Which Plants Catch Animals in Underwater Bladders?

Bladder worts are plants that generally grow in water, which is poor in nutrients. They. obtain nutrition in a very unique way by trapping insects and digesting them to overcome malnutrition to survive. They are often rootless plants with only the flower spikes above the water and the leaves bearing the trapping organs or the bladders. The bladders are hollow bags borne at the end of a stalk with a small entrance at one end and have projecting bristles. This gives it an appearance of a crustacean and so small crustaceans like water flea, come to it for protection. The trap gets ready by pumping out water and creating a vacuum inside. As soon as an insect touches the bristle, the trap door opens and water gushes in along with the animal. The animal dies which is then digested upon by glands in the bladder.