Suppose a fungus destroys the central xylem and phloem tissues in the roots of a tree. what function of the root system will be lost because of this damage

The roots will lose the tendency to transport minerals and water due to the damage of xylem and phloem tissues in the roots of a tree.  

Explanation:

A root exhibits four prime functions, that is, the captivation of water and inorganic nutrients, storage of nutrients and food, affixing of the plant body to the ground, as well as vegetative reproduction and competition with other plants. The absorbed minerals and water present in the roots are translocated to the rest parts of the tree or a plant for its optimal functioning. The xylem tissues perform this function of transporting water and minerals from the roots to the stems and leaves of the plant or tree. In case, if the tissues get damaged then roots lose the tendency to transport water and minerals to the higher parts of the plant or tree.  

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.