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Q.
Duramen is present in
Bihar CECEBihar CECE 2010
Solution:
After certain years of growth, the xylem elements of the stems of a number of trees develop dark brown colouratipn, especially in the central or innermost layers. This region comprises dead element with highly lignified walls and is called heart wood of duramen. It is present in inner region of secondary wood. The force between walls and water, molecules, called adhesion force.