Why do plants store their food?

Explanation:

Storing the food helps them to use it in winter and survive because there is very little sunlight available and so they photosynthesis less. When they have extra food they store it in their seeds and when the seed grows it gets it's food from the plant until the plant is able to photosynthesis and produce its food.

The main reasons being- survival, growth and reproduction

carbohydrates are the body's preferred source of energy.

i am going to guess that it is co2.