What causes the Venus fly trap to close it leaves around an insect?

The Venus flytrap closes its leaves around an insect due to a rapid response triggered by tiny hairs called trichomes on the inner surfaces of its lobes. When an insect touches these hairs twice within about 20 seconds, it signals the trap to close, allowing the plant to capture its prey. This mechanism ensures that the trap only closes when there is a high chance of catching food, conserving energy. Once closed, the plant secretes digestive enzymes to break down the insect and absorb nutrients.