Roots
A potato stores its "food"mostly as starch in a tuber.
Stem
in its stem
no, cassava stores food in the roots while irish potato stores food in the stem
it store food
* onion * potato * carrot * artishok
You could eat it. The calories in it are a measure of the energy it stores for nutrition. You could, perhaps, dry it and then burn it for heat. Bit of a waste of a good potato if you ask me. You could stick a length of copper and a length of zinc into it and use it to provide electrical energy. It's not as good as lemons, but it still works. It occurs to me that if you throw the potato, it will have kinetic energy but the energy has been put into the potato by your arm, so that probably doesn't count.
rice
Maori Pa had storehouses that kept harvested food such as Kumara (sweet potato).
Storage food for seeds and varietals. Potatoes store all that starch in their trbers because the eyes of the potato are the progeny of the potato.
sugarcane
In Walmart you might find it as there are many food items