Hint: It is a type of tissue in vascular plants that transports water and some nutrients from the roots to the leaves. It gives vascular plants their classification; they are the vascular tissues that transport substances throughout the plant.
The storage of metabolic products is not a function of xylem. It is a function of phloem because it is composed of still-living cells that transport sap. The sap may be a water-based solution, but rich in sugars made by photosynthesis.
These sugars are transported to the non-photosynthetic part of a plant, such as roots and storage organs, such as tubers and bulbs.
The main function of xylem is to move water, and a few soluble nutrients including minerals and inorganic ions, upwards from the roots to the remainder of the plant. Xylem cells structure long cylinders that transport materials and thus the combination of water and supplements that moves through the xylem cells are called xylem sap. These substances are transported through transport, therefore the process doesn’t require energy. The phenomenon that permits xylem sap to flow upwards against gravity is named capillarity. This occurs when a physical phenomenon makes liquid move upward. Water is additionally aided in moving up through the xylem by adhering to the xylem cells. However, it gets harder to figure against gravity to move materials as a plant grows taller, so xylem sets an upper limit on the expansion of tall trees.
So the correct answer is ‘Storage of metabolic products’.
Note: Xylem is made up of several types of cells. Tracheids are long cells that help transport xylem sap and furthermore offer basic help. Vessel components are more limited than tracheids yet additionally help lead water. They are found in blossoming plants, yet not in gymnosperms like pine trees. Vessel elements have perforation plates that connect each vessel element to make one continuous vessel.