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The Role of Carbohydrates Carbohydrates are a very large group of molecules that can be synthesised by plants. They are molecules which contain carbon, hydrogen and oxygen atoms. Usually there is a ratio of 2:1 of hydrogen to oxygen atoms in a carbohydrate molecule. Carbohydrates are very common constituents of plants. They make up to around 90% of the dry mass of plants. Carbohydrates are also an essential part of the animal diet and they are usually obtained directly or indirectly from plants. The functions of carbohydrates vary greatly. There are many different carbohydrates with different sizes and structures, all of which perform a different task in plants or animals. Functions range from being an energy store to providing structural support and strength. There are three types of carbohydrates; they are the monosaccharides, disaccharides and polysaccharides. This division is based on the fact that polysaccharides are non-sugars whereas monosaccharides are simple sugars...

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