Question

what is the function of a stem on a plant

Answer 1

Stem has many functions in a plants.., some of them are :--
1-- It helps the plant to stand straight..
2--In some plant it stores food
3--It acts as a transportation medium of food to all parts of plants which was prepared by the leaf

Answer 2

The primary functions of the stem are to support the leaves; to conduct water and minerals to the leaves, where they can be converted into usable products by photosynthesis; and to transport these products from the leaves to other parts of the plant, including the roots. 

Hope it helps U... :)