The xylem elements perform the function of transport but they also help to support plants because they

Xylem is a tissue that transports water and minerals from the roots to the other parts of the plant. Xylem elements, such as tracheids and vessels, have rigid, thick walls made of lignin, which provides mechanical support to the plant. These walls help the xylem to maintain its shape and prevent it from collapsing under the weight of the water it is transporting. Additionally, the xylem elements are arranged end to end in a tubular manner which further enhances their ability to provide support to the plant. Therefore, the xylem elements not only transport water and minerals, but also help to support the plant.