Plants obtain the majority of the carbon necessary for building these structural molecules from carbon dioxide.
The carbon is derived from the carbon dioxide produced during photosynthesis. Plants convert the sun's energy into chemical energy, which is captured within the bonds of carbon molecules formed from atmospheric carbon dioxide and water during photosynthesis. Carbon dioxide diffuses through stomata, which are small holes on the underside of the leaf.
Plants use the sun's energy to convert water and carbon dioxide into glucose, a sugar. Plants use glucose for energy and to make other substances such as cellulose and starch. Cellulose is used to construct cell walls. Starch is stored as a food source in seeds and other plant parts.
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