Question

If you uproot a plant from the soil, why do leaves exbit wilting ?

Answer 1

If you uproot the plant from the soil, all of its leaves show wilting because root is the principle organ which absorbs water and nutrients from the soil. 
The roots of a plant are mostly seen underground and look brown in colour. The tiny thread-like structures over the roots are the root hairs. Roots penetrate deep into the soil in search of water. Root hairs absorb water and the dissolved nutrients in it.  Root hairs are highly permeable to water. These root hairs also have lot of fluid filled vacuoles. The old root hairs are periodically replaced by the new ones. Roots are responsible to supply water and nutrients to entire plant all through its life.
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Answer 2

when a plant is uprooted it will not get sufficient water ,nutrients and other substances needed for survival. so leaves starts to wilt.