FORESTRY
PLANT AND WOOD ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When the old sapwood dies, it becomes
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heartwood
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firewood
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softwood
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hardwood
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Explanation:
Detailed explanation-1: -On the average only about 10% of the sapwood cells are alive. As the xylem ages all the living cells die and the tissue often becomes darker, producing a central cylinder of dark-colored dead tissue, called heartwood, which continues to provide mechanical support but is no longer involved in physiological processes.
Detailed explanation-2: -In Eucalyptus species (Hillis 1972, 1987) the trees start to form heartwood between 5 and 8 years.
Detailed explanation-3: -2. Cells present in heartwood are older compared to sapwood. Cells that constitute sapwood are comparatively younger.
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