Insect-eating plants’ unique strategies for catching live prey have long captured the public imagination. But even within this strange group, in which food-trapping mechanisms have evolved multiple times independently, some unusual ones stand out. According to Ulrike Bauer, an evolutionary biologist, the visually striking pitcher plant Nepenthes gracilis, for example, can _______________________________________. This species’ pitcher has a rigid, horizontal lid with an exposed underside that produces nectar, luring insects to land on it. When a raindrop strikes the lid’s top, the lid jolts downward and throws any unsuspecting visitor into digestive juices below. Researchers used x-ray scans to analyze cross sections of the pitchers when the lid is raised, lowered, and in a neutral position. Their results revealed a structural weak point in the pitcher’s neck: when a raindrop hits the lid, the weak spot folds in and forces the lid to quickly move downward, similar to a diving board. The weak point makes the pitcher’s body bend and bounce back in a specific, consistent way, so the lid rises back up without bouncing too far ― unlike a typical leaf’s chaotic vibration when struck by rain.
* pitcher: 주머니 모양의 잎 ** nectar: (식물의) 꿀
*** jolt: 덜컹거리다, 흔들리다