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Identify And Explain The Difference Between Heartwood And Sapwood

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As woody stems grow older, the innermost growth rings lose their vital functions of conduction and storage. They die out completely, become plugged up by tyloses (the walls of tyloses sometimes becoming hard and stony through the process of '‘sclerosis'’) and undergo chemical modifications, being filled with wastes such as resins, tannins, gums, volatile oils, and colouring matters. This central, generally darker, core is called heartwood (or duramen), while the outer lighter portion is called sapwood (or alburnum). The boundary between the two is commonly irregular. The innermost part of the sapwood is continuously being changed into heartwood as more and more sapwood is formed by the cambial cells, resulting in a progressively expanding core
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