If you cut a bindweed at the bottom why does it die?

Cutting bindweed at the bottom disrupts its ability to transport nutrients and water from the roots to the rest of the plant. This interruption can weaken the plant significantly, as it relies on its root system for sustenance. Additionally, bindweed often has extensive root systems, and if the cut is made below ground level, it can prevent the plant from regenerating. However, due to its resilience, it may still regrow if any part of the root remains intact.