Question

how does the plants use the food that it prepares

Answer 1

plants make their food by photosynthesis
the synthesised food is stored as carbohydrates,glucose as well as starch.
hope it helps.and mark as brain list.because it's not a copied answer.

Answer 2

The plants use it in it's different life processes. The surplus amount of food is stored in the different parts of the plants. These food we get it for ourselves is the surplus amount of food by the plants. 

HOPE IT HELPS YOU....