Why do most plants die very quickly if their roots are cut off?

Most plants rely on their roots for water and nutrient uptake, which are essential for their survival. Cutting off the roots disrupts this vital connection, leading to dehydration and nutrient deficiency. Additionally, roots anchor the plant in the soil, and without them, the plant may become unstable and unable to maintain its structure. Consequently, the lack of support and resources results in rapid decline and death.