SOURCE
All vegetable food is obtained from plants; it is some part of a plant used as food.
PARTS OF PLANTS USED AS FOOD
1. Root—carrot, radish
2. Tuber—potato, artichoke
3. Bulb—onion
4. Stem—rhubarb, asparagus
5. Leaf—spinach, cabbage
6. Flower—cauliflower
7. Fruit—apple, orange