Question
Distinguish between sapwood and heartwood.
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Sapwood
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Heartwood
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1
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It is the outer region of xylem of an old stem.
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It is the central part of secondary xylem of an old stem.
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2
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It is light or pale coloured.
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It is dark brown in colour.
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3
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It contains living xylem parenchyma.
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Parenchyma has died down.
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4
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Tyloses are absent.
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Tyloses (sing. tylosis) which are intrusions of parenchyma cells into tracheary elements are present.
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5
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It is light in weight
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It is heavier.
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6
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It is prone to attack of insects and pathogens.
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It is resistant to attack of pathogens and insects.
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