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Carbohydrates. The carbohydrates are the compounds which provide energy to living cells. They are compounds of carbon, hydrogen and oxygen with a ratio of two hydrogens for every oxygen atom. The carbohydrates we use as foods have their origin in the photosynthesis of plants.They take the form of sugars, starches, and cellulose.oth starches and cellulose are carbohydrates which are classified as polysaccharides since they are composed of chains of glucose molecules. While they are similar, starches can be used as energy sources by the human body while cellulose cannot.
Objectives: 1  Students will understand that carbohydrates are one of three energy sources for the body. 2  Students will be able to describe how carbohydrates are used for energy. 3  Students will be able to name food sources of carbohydrates.