![]() The traps of type 3 are the most advanced types of mechanism found in the plant world. ![]() This movement is not haphazard a fly caught in the edge of a sundew leaf is pushed to the center so that it can be enveloped and digested more effectively. This can be compared to the pit-fall type of trap set for large animals. Insects are prevented by various means from escaping, and finally they fall into the liquid and drown. This is the simplest type, such as the sundew (genus Drosera ). This works very much like the fly-papers which are sometimes hung up in houses to catch flies. ![]() The devices by means of which they entrap their prey can be classified under three kinds of insect trap. In normal plants it is only the roots that absorb nutrients. It contains enzymes, such as pepsin and trypsin, very similar to those produced in the stomach of animals. Most carnivorous plants have glands of this kind, which secrete a digestive ferment. This liquid has the double function of trapping and digesting the prey.
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