Roots and tubers are plants yielding starchy\xa0roots,\xa0tubers, rhizomes, corms and stems. They are used mainly for human food (as such or in the processed form), for animal feed and for manufacturing starch, alcohol and fermented beverages including beer. … FAO distinguishes among seven primary\xa0root and tuber\xa0crops.\xa0Potato\xa0is considered as a\xa0stem\xa0vegetable because it grows in underground stems, known as stolons.\xa0Potato\xa0tubers are considered to be thick stems that have the buds sprouting stems and leaves.\xa0