What is the main purpose of xylem in vascular plants?

The main purpose of xylem in vascular plants is to transport water and dissolved minerals from the roots to the rest of the plant. Xylem vessels are specialized for this function, consisting of hollow tubes that facilitate efficient movement of these essential resources. The water transported through the xylem is vital for various physiological processes, including photosynthesis, nutrient uptake, and regulating temperature through transpiration.

While the other options relate to important functions within the plant, they do not describe the primary role of xylem. For example, sugars are transported through phloem, which is distinct from xylem; nutrient storage occurs in various plant tissues, including parenchyma cells; and structural support is mainly provided by lignified xylem cells, but this is a secondary role compared to water transport. Therefore, the correct choice reflects the essential function of xylem, emphasizing its role in water and mineral transport.