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Plants store energy in the form of Glucose
Starch
Photosynthesis is the process used by plants to convert light energy, usually in the form of solar energy from the sun, into chemical energy that is stored in carbohydrate molecules.
Carbohydrates are stored as complex sugars. The larger molecules are called starch and bigger than that is cellulose.
The primary form of carbohydrate is glucose. It is also the preferred energy source of the body.
The food they eat, in the form of sap from plants, and blood from animals.
Glucose is the simplest carbohydrate and so probably the most abundant. It is required by every living cell for energy.
Starch is the storage form of carbohydrates in plants. In contrast, glycogen is the storage form of carbohydrates in animals.
They are stored in glycogen, and used for energy. I hope you don't mind that I deleted the "traveling in light waves answer"
Storage of food in plants. As starch is insoluble and compact, it is the most ideal form for storage in plants. For animals, starch is a source of carbohydrate. Therefore source of energy.
Metabolically speaking, the sugars are the most important reservoirs of energy for quick release. In animals, sugars, in the form of glycogen, are kept in muscles. In plants, the main sugar reservoir is the starch.
A carbohydrate is a nutrient which is non-essential. It provides the body with easy accessed energy in the form of glucose.