1) Beets 2) Jerusalem artichokes 3) Potatoes 4) Potatoes and rutabagas 5) Potatoes and yams 6) Potatoes or yams 7) Propagative parts of a plant 8) Rutabagas 9) Underground edibles 10) White truffles 11) Yams 12) Yams and potatoes 1) Roots 2) Yams 
(Variation and inheritance) enlarged underground plant stems which store food
a swollen, underground stem that has buds from which new plant shoots can grow. An example of a tuber is a potato.