안녕하세요 ^^

식물의 종류에 따라서 stem , root 에 각각 혹은 둘다에 store 합니다. stem 의 원래 역할은 water and minerals conduction이지만, stem에 store food 을 하면 modified stems을 가지고 있다 라고 얘기합니다.  

그 예를 들자면 아래와 같은 것들이 있습니다. ^^ ( 시험에는 안나오니 참고용으로만 읽으세요 ) 

( 출처 : quora) https://www.quora.com/Which-plants-preserve-food-in-stems

Garlic:-

The edible portion is predominantly swollen leaves with a bit of stem.

Ginger root:-

The edible portion is a branched underground compressed stem also referred to as a rhizome.

Kholrabi:-

The edible portion is an enlarged (swollen) stem. It is a member of the cabbage family and is white, green, or purple in color.

Leek:-

Similar to other members in the onion family, the edible portion is swollen leaves with a bit of stem.

Lotus root:-

The edible portion is a stem modified for underwater growth. Buds and branches are visible on the vegetable sold as lotus root.