The ability of the venus flytrap to capture insects is due to

Insectivorous plants grow in water logged swampy soils, deficient in nitrogenous compounds. These plants obtain their nitrogen compounds from the insects. Due to this reason, these plants are called as semi-autotrophic or semi-heterotrophic. Dionea (an insectivorous plant) is commonly called as venus fly trap. Leaves of this plant have winged petiole and lamina modified into two toothed jaws. Each jaw bears several teeth. Upper surface of each jaw bears triangularly arranged long sensitive hairs or bristles and many glands, which are irregularly scattered. These hairs are very sensitive to touch stimulus. When an insect touches these hairs, this stimulus causes rapid turgor pressure changes which closes the leaf.