The correct answer is option 1: water.

The xylem tissue in plants is responsible for the upward transport of water and dissolved minerals, from the roots to the rest of the plant. It is like a network of tiny tubes that run vertically through the plant. Through a process called transpiration, water evaporates from the leaves, creating a pull that draws water up through the xylem from the roots. This pull is known as the "transpirational pull" or "cohesion-tension theory."

Although option 2 mentions food, the transport of food or nutrients in plants is primarily carried out by a different tissue called phloem. Phloem tissue is responsible for the transport of sugars, amino acids, hormones, and other organic molecules from the leaves (where they are produced) to the other parts of the plant.

Option 3, which suggests that xylem conducts both water and food, is incorrect because xylem is exclusively involved in the transportation of water and minerals.

Option 4 states that none of the options are correct, but in this case, option 1 is indeed correct.