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The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf. Water enters the root and is transported up to the leaves through specialized plant cells known as xylem vessels.
The main source of carbon for plants comes from the atmosphere as carbon dioxide and fixation of this carbon dioxide by leaves and other. green parts of the shoot system in the presence of light as an energy source - the process of photosynthesis. Some of this fixed carbon is. converted into fuels for respiration, such as glucose, some is stored as compact materials like starch, and some is used in building blocks, such as proteins, nucelotides and phospholipids, to build the plant body. Fixation is an odd word, and one that stems all the way back to alchemy. It makes perfect sense, however, when you think of gases as. mobile, with their molecules constantly moving around by diffusion due to their thermal kinetic energy.