Why the colour of wood is always brown
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Due to the presence of lignin.
Explanation:
Lignin- It is the carbohydrate 'glue' that sticks all cellulose molecules together. Woody plants have a range of carbohydrates from what we can extract as long chain cellulose, shorter or chemically broken bits called hemicellulose, and the related carbohydrates we call lignin, all attached together. There is no single formula for each of these categories as there is a kind of continuous increment of groups in each chain, from one to the other.
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