Question

What will happened if xylem vessels of a plant are plugged

Answer 1

THE LEAVES WILL BE  WILTED AND NO CONDUCTION OF THE WATER WILL TAKE PLACE 
THE PLANT WILL SHRINK

Answer 2

Xylem vessels of plant are plugged:

The xylem vessel of the plant is responsible for the conduction of the water in the plant body. So if the xylem vessel of the plant become plugged then the conduction of the water will stopped and then the plant will be wilted and no water movement will be take place in the plant body so the plant become shrink due to the loss of water. If the condition is remain continued then after sometime the plant will be died.