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What is duramen of heartwood?

Answer
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Hint: With progress in time, the central axis of 20 xylem turns inactive, missing water and stockpiled food material. It comes to be filled with different byproducts of metabolism. This zone becomes tough in texture and dark in color and is known as heart wood or else duramen. This region loses the role of transfer of nutrients. Each heartwood is dark but not all dark-colored wood is heartwood.

Complete answer:
Heartwood, also termed as duramen, unresponsive (dead), inner wood of trees. Its cells generally include tannins or other elements that make it to be dark in color and sometimes scented. Heartwood is instinctively strong, resilient to decomposition, and less easily infiltrated by wood-protective chemicals than other kinds of wood. One or more tiers of living and working sapwood cells are transformed to heartwood over a period of time.
Heartwood or duramen is the dark-colored wood close to the focal point of the axis developed after some years of 20 development of the stem. A small outer area still stays to be light colored which is called alburnum or sapwood. The heartwood gets shaped due to alterations in the components of the 20 xylems. The amount of heartwood increases as the tree matures and becomes older as the quantity of sapwood nearly remains steady.

Note:
As these elder sapwood cells get older and die, they develop into heartwood. They are modified to adapt a change in function. As remains of the once-living cells and supplementary chemical compounds from somewhere else in the plant pile up in the heartwood, those cells terminate the transportation of water or store energy assets. Heartwood, which is mostly but not all the time dark colored, results from the natural maturing procedure of the tree.