Explanation:

Transplanted seedlings experience some degree of transplant shock.  It is generally caused by damage to the roots of the plant during the transplant. During a transplant, the  fine roots are usually destroyed either by being cut to keep the root ball size down, by drying or simply by being jarred and jostled around in the move. As a result of the loss of these feeder roots, the plant is not able to draw the amount of moisture it requires to thrive and grow. The resulting imbalance between the moisture demands of the top growth and the reduced ability of the roots to meet those demands manifests as transplant shock.