What is the primary function of xylem in higher plants?

The primary function of xylem in higher plants is to transport water and dissolved minerals from the roots to the aerial parts of the plant, such as the stems and leaves. This process is essential for the plant's survival as it enables photosynthesis by delivering water to the leaves, where it is used along with carbon dioxide to produce sugars. Additionally, the xylem conducts essential nutrients that are dissolved in the water from the soil, allowing for necessary metabolic processes to occur throughout the plant.

While other choices mention various functions like transporting nutrients from leaves to roots, food storage, or providing structural support, these do not accurately describe the main role of xylem. Nutrient transport primarily occurs in phloem, while food storage may happen in various plant tissues, and structural support is provided by both xylem and other tissues but is not the primary function of xylem alone. Therefore, the correct answer clearly highlights the vital role of xylem in maintaining the health and function of higher plants.