A) inner region of secondary wood
B) part of sap wood
C) outer region of secondary wood
D) region of pericycle
Correct Answer: A
Solution :
After certain years of growth, the xylem elements of the stems of a number of trees develop dark brown colouration, especially in the central or innermost layers. This region comprises dead element with highly lignified walls and is called heart wood or duramen. It is present in inner region of secondary wood.
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