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Question
The dark coloured dead wood present in the central region of old trees is
The dark coloured dead wood present in the central region of old trees is
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Solution
The correct option is B Heart wood
With the advance in age, the central axis of secondary xylem becomes inactive, lose water and stored food material. It becomes infiltrated with various organic chemicals like oil and ergastic substances (byproducts of metabolism). This region becomes hard in texture and dark in color and is called heartwood or duramen. This zone loses the function of conduction of nutrients. Thus, the correct answer is option B.
With the advance in age, the central axis of secondary xylem becomes inactive, lose water and stored food material. It becomes infiltrated with various organic chemicals like oil and ergastic substances (byproducts of metabolism). This region becomes hard in texture and dark in color and is called heartwood or duramen. This zone loses the function of conduction of nutrients.
Thus, the correct answer is option B.
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